Why is it important to know a person's rhesus factor before a blood transfusion? A patient who is Rh+ can receive only Rh– blood. A patient who is Rh– can receive only Rh+ blood. A patient who is Rh+ can receive only Rh+ blood. A patient who is Rh– can receive only Rh– blood.

QUESTION POSTED AT 26/03/2020 - 09:04 PM

Answered by admin AT 26/03/2020 - 09:04 PM


Rh- blood can only receive Rh- blood.


-Rhesus factor is a type of antigens on the surface of red blood cells, beside the antigens of blood groups , Humans are classified according to the presence of Rhesus factor in their blood into Positive Rhesus factor (Rh+) and Negative Rhesus factor (Rh−).

- When it comes to blood transfusion, anyone who is Rh positive can receive blood from someone who is Rh negative, but those with negative blood types cannot receive from anyone with a positive blood type.

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Related questions

What two factors have been the GREATEST contributors to the exponential growth of the human population during the last two centuries? A) plentiful food and a mild climate B) the industrial revolution and peace Eliminate C) agricultural developments and peace D) good sanitation and medical advances

Answer: D)  good sanitation and medical advances

In the exponential growth, the population's growth rate increases over time, in proportion to the size of the population. It causes the population to increase faster in numbers. Good sanitation and medical advances will contribute to the exponential growth of the human population because clean environment will prevent the accumulation of pathogen inside the body and hence will prevent the cause of diseases. Medical advances will help in curing of deadly diseases like cancer hence, will increase the likelihood of survival of more number of individuals.  

ANSWERED AT 31/03/2020 - 10:42 AM

QUESTION POSTED AT 31/03/2020 - 10:42 AM

Consider this northern site of primary succession following the retreat of a glacier. As we move from left to right, describe some improvements in the abiotic factors that support plant growth. A) change in climate over time B) less competition for water resources due to biodiversity C) improved soil quality: increased humus and water retention D) increased population density resulting in decreased pathogens

Answer: C. improved soil quality: increased humus and water retention.


An ecological succession brings change in the type of living species residing in an ecosystem with respect to changes that occur in the abiotic (non-living factors) with respect to time.

A region affected by a retreating glacier will not be suitable for the growth of living species. The soil may be lacking minerals and will be in the permafrost condition. So for the initiation of succession the improvement in soil an important abiotic factor is required. The improved soil quality will allow the accumulation of organic and inorganic minerals by physical and biological processes. This will help in formation of humus and water retention.

ANSWERED AT 28/03/2020 - 12:55 PM

QUESTION POSTED AT 28/03/2020 - 12:55 PM

What is the best synonym for hormone A. Bodily organ B. bodily tissue C. Blood cell D. Chemical Messenger

I would go with c because hormone have to travel blood cells

ANSWERED AT 28/03/2020 - 12:47 PM

QUESTION POSTED AT 28/03/2020 - 12:47 PM

Why are the Galapagos Islands important in our understanding of how species adapt to their enviornment? Discuss it's geographic location, what Darwin concluded, and the researcj of the Grants

Charles concluded that the finches beaks are examples of adaptive radiation. To fit in the island, they had to adapt to the conditions. This lead to Charles’ theory of natural selection. Charles came to the conclusion of evolution and natural selection. Natural selection is the process where organisms adapt to their environment to survive and produce more offspring. Evolution is where different kinds of living organisms are thought to have developed. These theories have changed science forever and leave today’s scientists marveling of his theories. 

The Galapagos Islands are located in Ecuador and sit on the Pacific Ocean.
The Galapagos Islands were formed from 3 million to 5 million years ago. Volcanic eruptions typically shield volcanoes formed the islands. They are located over a “particularly hot mantel” that causes volcanic activity. The outcome of many eruptions were islands because the left overs were pushed to the surface. The Galapagos islands are pretty big reaching an area of 3,093 miles. The temperatures range from 69 to 84 degrees creating a typically warm climate. 

All plants and animals are native to the islands. It is likely that sea animals swam there, birds flew there (with the help of wind), and reptiles and small animals were carried on rafts of vegetation. Since all the plants and animals are native to the islands, they had to adapt to the new food source and climate. Beaks, size, etc. are all changes made to these organisms to be able to live on the islands. 

The Grant’s research on the Galapagos Islands showed that evolution exists and can happen over a course of two years. They proved Darwin’s theories are true.  They observed the evolution of the finches and are said to have seen it with their own eyes. They spent years measuring beaks of the finches and documented change overtime.

Darwin’s research showed that finches beaks are different to fit their food source. It also started the theories of evolution and natural selection.  

ANSWERED AT 28/03/2020 - 12:38 PM

QUESTION POSTED AT 28/03/2020 - 12:38 PM

1. How do your skeleton and muscular system work together, 2. What type of muscle tissue would you find in the heart? blood vessels? toes?

The answer to your first question involves a connection between your actions and your brain. Your bones and muscles work together through a series of impulses and signals communicated between the brain and skeletal muscles. In order to move, the nervous system then sends signals a skeletal muscle to contract. When the muscle contracts, this movement causes the attached bone to follow.

And as for your second question, 
The muscle tissue in your heart is cardiac, the muscle tissue in your blood vessels is smooth, and the muscle tissue in your toes is skeletal. 

I hope this helps you, have a nice day!

ANSWERED AT 28/03/2020 - 12:27 PM

QUESTION POSTED AT 28/03/2020 - 12:27 PM

What are 2 factors that would limit population growth in marine life

The answer is Food and Nutrients

ANSWERED AT 28/03/2020 - 11:59 AM

QUESTION POSTED AT 28/03/2020 - 11:59 AM

What are some limiting factors that could affect an owls survival

Lack of space (habitat loss), low birth rate (low productivity) and high death rate (high mortality).

ANSWERED AT 28/03/2020 - 11:51 AM

QUESTION POSTED AT 28/03/2020 - 11:51 AM

A student observes an animal that has a backbone, gills, and scales. It lays eggs and is cold−blooded. What does this animal have in common with all mammals? Answer Options with 5 options A. a backbone B. gills C. scales D. egg−laying E. cold−blooded

A. a backbone

If you think about it, us mammals (humans are mammals) don't have gills, scales, we do not lay eggs, and we are not cold-blooded. But we do have a spine, or backbone.

ANSWERED AT 28/03/2020 - 11:39 AM

QUESTION POSTED AT 28/03/2020 - 11:39 AM

Which of these factors does CITES fail to consider when determining which species to cover? A. Species population B. Economic impact C. Analysis of trade D. Ecosystem sustainability

Option D, ecosystem sustainability, is the right answer.

"The Convention on International Trade in Endangered Species" is the full form of CITES. The CITES is a global agreement among nations. The main aim of CITES is to assure that global trade in parts of plants and wild animals does not endanger their survival. However, it failed to include ecosystem sustainability while determining which varieties to be covered.

ANSWERED AT 28/03/2020 - 11:24 AM

QUESTION POSTED AT 28/03/2020 - 11:24 AM

Several species of fish and marine life eat plankton. How is that diversity important to the ecosystem as a whole?

Plankton is at the bottom of a food chain. Think of a pond. Mosquito larvae are in a pond. They eat the plankton. Small fish eat the larvae. Larger fish eat those smaller fish and the chain keeps going..BUTTT it all started with the PLANKTON. Without the plankton the whole food chain would be messed up and everything would start dying.. No plankton, no larvae, no small fish..and so on..

ANSWERED AT 28/03/2020 - 11:21 AM

QUESTION POSTED AT 28/03/2020 - 11:21 AM

Sickle-cell disease is a genetic disorder that causes many red blood cells to become sickle shaped. As shown in the diagram, sickle-shaped cells can clog blood vessels and impede blood flow. What does the effect of sickle-shaped cells on blood flow imply about the shape of normal red blood cells?


The answer is :

Blood viscosity increases and results in decreased blood flow throughout the body.


Blood flow is directly proportional to pressure and indirectly proportional to resistance.

Sickle-shaped blood cells tend to accumulate and increase the blood viscosity, which increases resistance. Therefore, blood viscosity increases and results in decreased blood flow throughout the body.

This answer is for STUDY ISLAND.

ANSWERED AT 28/03/2020 - 11:17 AM

QUESTION POSTED AT 28/03/2020 - 11:17 AM

Which factor do oceanographers measure in order to determine the salinity of ocean water

The salinity of ocean water can be determined by measuring the conductivity of the water. The characteristics of water such as salinity, depth, temperature, density can be defined by the instrument called Conductivity Temperature Depth instrument. This instrument is placed in water which is to be measured. As this instrument is lowered into the water it continuously records the conductivity, temperature and depth of the water. The electric current is flowed through the water and as we know salt water is a good conductor of electricity it will pass the current fast. Using this technique oceanographers determine the salinity of water.

ANSWERED AT 28/03/2020 - 10:54 AM

QUESTION POSTED AT 28/03/2020 - 10:54 AM

A legal order for an investigation into whether a person who is arrested has been imprisoned legally defines A) habeas corpus. B) trial by jury. C) popular sovereignty. D) checks and balances.


Habeas corpus

Habeas corpus is a legal order for an investigation into whether a person who is arrested has been imprisoned legally.


-A Writ of Habeas Corpus directs a person, usually a prison warden, to produce the prisoner and justify the prisoner's detention. If the prisoner argues successfully that the incarceration is in violation of a constitutional right, the court may order the prisoner's release.

-Popular sovereignty is the idea that a government's power comes from the people.

-Checks and balances is a system in which the branches of government keep each other's power in check

ANSWERED AT 28/03/2020 - 10:33 AM

QUESTION POSTED AT 28/03/2020 - 10:33 AM

My mother, along with all of my godparents, began planning my quinceañera after I turned fourteen. My mother and aunts took me to a bridal shop where I was fitted for a long, white gown, which I would wear at the celebration. I felt my cheeks grow red with embarrassment as the women fawned and fussed over me in the store. I desperately wished that I could just find a hole to crawl into and hide, but there was no way out. My mother, who was in her glory, naturally assumed that the redness in my face was a glow of happiness. I let her go right on thinking that. It was her day, I kept telling myself. I was doing this for her. At last, the big day came. My father cooked up a special breakfast for my brothers and me first thing that morning. I had a queasy feeling in the pit of my stomach, but I was somewhat comforted by my father's easygoing manner and his apparent anticipation of the celebration ahead. After breakfast, my mother helped me dress for the quinceañera. While she was styling my hair, she paused every so often to wipe away a tear of joy that had trickled down her face. I couldn't recall ever having seen my mother quite this happy, and suddenly my heart swelled with affection for her. Two hours later, I found myself standing in the front of a church while all of my dearest friends and family members gazed up at me from the pews. As I looked out on the smiling, supportive faces of all the people I loved, I had an unexpected realization. This day wasn't for my mother after all; it was for me. The church ceremony was followed by a fiesta that lasted all day and into the night. My parents served food that they had worked for days to prepare. A disc jockey played all of the music I loved, and I was showered with beautiful gifts, practical advice, and good wishes from everyone important to me. As I watched my family members celebrate in my honor, I realized that my Mexican heritage was not something intangible, like a bunch of old stories about long-gone relatives. My heritage, I realized, was very real. It was with me at all times, and I was proud of it. What is the purpose of this essay?

To entertain/or to tell a story

ANSWERED AT 28/03/2020 - 10:27 AM

QUESTION POSTED AT 28/03/2020 - 10:27 AM

HELP! 20 POINTS! In which order do gases and nutrients pass from the mother, through the placenta, to the infant? A. Maternal blood pool; chorionic villus; umbilical vein B. Umbilical vein; chorionic villus; maternal blood pool C. Maternal blood pool; umbilical vein; chorionic villus D. Umbilical vein; maternal blood pool; chorionic villus

Answer: Option A

The embryo in the mother's womb cannot eat or drink anything from the outer world. It gets its nutrition from the placenta that is attachment found between the mother and embryo.

The nutrients and gases pass from the mother to embryo in following order. Maternal blood pool ; chorionic villus ; umbilical vein.

In this way the nutrients and gases are carried to the fetus and waste products are taken back through this umbilical cord back for purification.

ANSWERED AT 28/03/2020 - 10:26 AM

QUESTION POSTED AT 28/03/2020 - 10:26 AM

The graph shows the changing levels of hormones during menstruation and ovulation. What happens to hormone levels during ovulation, and why is this important? a.The hormone levels increase to prepare a woman’s body to receive a fertilized egg. b.The hormone levels decrease to prepare a woman’s body to receive a fertilized egg. c.The hormone levels increase, and the next menstrual cycle begins with shedding of the uterine lining. d.The hormone levels decrease, and the next menstrual cycle begins with shedding of the uterine lining.

The given graph shows the levels of the different hormones during the period of ovulation. During the phase of the ovulation, the hormones level increase. This increase in  the levels of the hormones prepare the uterus for the fertilization of the egg. The uterine line is thickened. This is the phase when the LH  (Luteinizing hormone) surge occurs, which refers to the sudden increase in the levels of LH. Moreover, the levels of FH, estradiol, and progesterone are also increased at different rates during ovulation.

Hence, the correct answer is 'option A - The hormone levels increase to prepare a woman's body to receive fertilized egg'.

ANSWERED AT 28/03/2020 - 10:21 AM

QUESTION POSTED AT 28/03/2020 - 10:21 AM

Blastula cells are stem cells, why is this so important?

A single-celled zygote will undergo multiple rounds of cleavage, or cell division, in order to produced a ball of cells, called a blastula, with a fluid-filled cavity in its center, called a blastocoel.In animals with little yolk in the egg, the zygote undergoes holoblastic cleavage, in which the entire zygote is cleaved repeatedly; in animals with a lot of yolk in the egg, the zygote undergoes meroblastic cleavage, in which only part of the zygote is cleaved.The blastula eventually organizes itself into two layers: the inner cell mass (which will become the embryo) and the outer layer or trophoblast (which will become the placenta); the structure is now called a blastocyst.During gastrulation, the blastula folds in on itself to form three germ layers, the ectoderm, the mesoderm, and the endoderm, that will give rise to the internal structures of the organism.

ANSWERED AT 27/03/2020 - 01:01 PM

QUESTION POSTED AT 27/03/2020 - 01:01 PM

Explain the importance of the chemical and physical properties of water that make it vital to life

Chemical- contains nutrients and vitamins that the body needs to survive and sustain . For example water is made up of hydrogen and oxygen, in which life wouldn't be without oxygen

physical- water is naturally clear and pure free from artificial processing and colors which positively caters to the healthy look of a person

Please vote my answer branliest! Thanks.

ANSWERED AT 27/03/2020 - 12:48 PM

QUESTION POSTED AT 27/03/2020 - 12:48 PM

What factors determine whether a species can be present in a place?

Weather and food supply

ANSWERED AT 27/03/2020 - 10:03 AM

QUESTION POSTED AT 27/03/2020 - 10:03 AM

What are the two defining factors of a terrestrial biome?

Their climate, and dominate vegetation. 

ANSWERED AT 26/03/2020 - 09:01 PM

QUESTION POSTED AT 26/03/2020 - 09:01 PM

Why is diversity of life an important indicator of water quality?

Dissolved oxygen levels. The solubility of oxygen decreases as water temperature increases.Chemical processes. Temperature affects the solubility and reaction rates of chemicals. In general, the rate of chemical reactions increases with increasing water temperature.Biological processes. Temperature affects metabolism, growth, and reproduction.

ANSWERED AT 26/03/2020 - 03:25 PM

QUESTION POSTED AT 26/03/2020 - 03:25 PM