What is the primary role of the respiratory system in living organisms? A. to make carbon dioxide B. to obtain oxygen C. to use up nitrogen D. to find hydrogen

QUESTION POSTED AT 18/01/2020 - 06:02 AM

Related questions

Letter D is the part of the cell that makes proteins. What is letter D? A) ribosomes B) chromosomes C) chloroplast

the answer is A.RIBOSOMES

ANSWERED AT 24/02/2020 - 12:27 AM

QUESTION POSTED AT 24/02/2020 - 12:27 AM

A microbiologist is in the process of classifying a newly discovered organism. Its characteristics include: · eukaryotic · multicellular · reproduces by spores · motile in some stage of its life cycle · decomposer Which type of organism is it most likely to be? club fungus fungus-like protist plant-like protist sac fungus

Based on the characteristics of the new organism discovered by the biologist, it can be concluded that this organism is most likely a fungus-like protist. The organism is a multi-cellular eukaryote who reproduced by the spores and is motile in few stages of the life cycle. Besides all this it is a decomposer. This all characteristics fit the description of a fungus like protist. They are most commonly found on the dead wood, but they also produce spores like the fungi.

Hence, the correct answer is 'fungus-like protist'.

ANSWERED AT 24/02/2020 - 12:18 AM

QUESTION POSTED AT 24/02/2020 - 12:18 AM

Why do saturated fatty acids have straight structures, while unsaturated fatty acids have bent structures? A.Saturated fatty acids contain more carbon atoms. B.Saturated fatty acids contain many more bonds. C.Saturated fatty acids have single carbon-to-carbon bonds. D.Saturated fatty acids have a larger mass.

Unsturated Fatty Acids have Structures - Option C

Saturated fatty acids have single carbon-to-carbon bonds. Saturated fatty acids are the fatty acids which contains only single bonds and the unsaturated fatty acids are those which has double or triple bonds. Fatty acids are made of long chains of carbons.

Therefore, saturated fatty acids have straight structures while unsaturated fatty acids have bent structures. Saturated fatty acids are solid at room temperature and unsaturated fatty acids are liquid at room temperature. Ghee is an example of saturated fatty acids and oil is an example of unsaturated fatty acids.

ANSWERED AT 24/02/2020 - 12:14 AM

QUESTION POSTED AT 24/02/2020 - 12:14 AM

____ is a layer of organic sediment. a. Peat c. Lignite b. Bituminous coal d. Anthracite coal

A.Peat organic matter which causes decaying matter 

ANSWERED AT 24/02/2020 - 12:11 AM

QUESTION POSTED AT 24/02/2020 - 12:11 AM

Why might introduction of exotic species disrupt an ecosystem? A. They're struggling to survive and can be disruptive. B. They die quickly and overfeed scavengers. C. There are very few of the organisms present. D. They can outcompete native species.

Answer: D. They can outcompete native species.

Exotic species are the species which are not native to the region to which they are introduced. They can be referred as alien, non indegenous species. These species are introduced either due to human intervention in order to use these species for their own benefit or these species migrate from their native land in search of food and other resources. These species may act as an invasive species, which means they compete with the native population for resources. Therefore, they will disturb the natural biodiversity of the ecosystem.

Hence, exotic species when introduced in an ecosystem they can outcompete native species.  

ANSWERED AT 24/02/2020 - 12:03 AM

QUESTION POSTED AT 24/02/2020 - 12:03 AM

How is an individual palm tree growing in a tropical forest classified organism,population,abiotic,habitat


The correct answer is- organism


An organism is an individual who has all the living characteristics. So an organism can be plat, animal, or a microorganism. So here we are talking about an individual palm tree and we know that a palm tree is a plant which has life so palm tree will be classified as an organism.

When many individuals of the same species are present in an area then it is called a population. The area where a population is living is called their habitat. Abiotic factors are the non-living things like air, water, soil. So the correct answer is- organism.

ANSWERED AT 23/02/2020 - 11:59 PM

QUESTION POSTED AT 23/02/2020 - 11:59 PM

Why did the invention of pcr make dna fingerprinting possible


With the invention of the PCR technique , DNA profiling took huge strides forward in both discriminating power and the ability to recover information from very small or degraded starting samples.

The process of PCR mimics the biological process of DNA replication but confines it to specific DNA sequences of interest.

In PCR process , the DNA sample is denatured into separate individual polynucleotide strands through heating. Two oligonucleotide DNA primers are used to hybridise to two corresponding nearby sites on opposite DNA strands. Thus two new copies of the sequences of interest are generated.

Repeated denaturation , hybridisation and extension in this fashion produce an exponentially growing number of copies of the DNA of interest.

Quantitative PCR methods enable automated , precise and high - throughput measurements.

ANSWERED AT 23/02/2020 - 11:50 PM

QUESTION POSTED AT 23/02/2020 - 11:50 PM

Many people try to eliminate fat from their diets. Which is one reason it is necessary for humans to eat fat? A.The internal organs are cushioned by fat. B.Eating fat is the fastest way to get energy. C.Fat stores less energy than polysaccharides. D.Saturated fats clear out the blood vessels.


A.The internal organs are cushioned by fat.


-Most of the nutrients in food fall into three major groups: proteins, fats, and carbohydrates. The body uses fat as a fuel source, and fat is the major storage form of energy in the body.By supplying energy, fats save proteins from being used for energy and allow them to perform their more important role of building and repairing tissues.

Fat also has many other important functions in the body, and a moderate amount is needed in the diet for good health.They also cushion internal organs, provide insulation against temperature and also facilitate absorption of fat soluble vitamins.

ANSWERED AT 23/02/2020 - 11:45 PM

QUESTION POSTED AT 23/02/2020 - 11:45 PM

Aquatic organisms have only a predatory relationship with coral reefs. True or false

I believe the answer is false.

ANSWERED AT 23/02/2020 - 11:39 PM

QUESTION POSTED AT 23/02/2020 - 11:39 PM

Humans cannot digest food without the aid of small single-celled organisms that live in our digestive tract. These small organisms help humans digest food by breaking down complex food molecules. Which common name is associated with these single-celled organisms that help humans digest food? A) algae B) bacteria C) protozoa D) virus

Bacteria are single-celled organisms that help humans digest food.


The symbiotic association of bacteria and human is of importance in the process of digestion. These bacterias are found in our gut, large intestine and sometimes in small intestine also. These bacteria break down big molecules into useful forms. Bacteria are also responsible for producing vitamin k2 and vitamin B in large intestine. They also help in mobilising of xenobiotics, bile and sterols.

ANSWERED AT 23/02/2020 - 11:32 PM

QUESTION POSTED AT 23/02/2020 - 11:32 PM

Do plants such as Ferns need to break down glucose in order to obtain energy

No they absorb the sun's energy directly.
Hope this helps

ANSWERED AT 23/02/2020 - 11:28 PM

QUESTION POSTED AT 23/02/2020 - 11:28 PM

18. In a species of wild animal, claw size is determined by a combination of two alleles. Allele Q codes for large claws, while allele q codes for small claws. Individuals with a heterozygous genotype possess claws of medium size. Members of the species depend on their claws to be able to burrow in the ground and find food. But in an area where the ground has always been soft, gradual climate change has caused the dirt to become hard and compact. Which statement best predicts the change that will occur in the affected populations? A. Allele q will decrease in frequency. B. Allele q will become dominant to allele Q. C. Allele Q will become dominant to allele q. D. Allele Q will decrease in frequency.

Answer: The correct answer is- A) Allele q will decrease in frequency.

According to the information in the question, allele Q codes for large claws and allele q codes for small claws in a species of wild animal.

This indicates that larger claws will enable the wild animals to burrow more in the ground and find their food. As the change in the climatic conditions caused the dirt on the ground to become hard and compact.

This will result in change in the frequency of allele of the population as allele Q will increase because larger claws will provide more advantage (in context of burrowing) to the animals for getting their food, whereas frequency of q allele will decrease ( as smaller size of claws will not be that beneficial to them in hard and compact ground).

Thus, option A) is the right answer.

ANSWERED AT 23/02/2020 - 11:24 PM

QUESTION POSTED AT 23/02/2020 - 11:24 PM

Surging photosynthesis, sugar c16h12o6 is produced from carbon dioxide, water, and sunlight, which statement best explains what happens during photosynthesis

Light energy is absorbed by chlorophyll and this is used to convert carbon dioxide and water into sugar called glucose 

ANSWERED AT 23/02/2020 - 11:22 PM

QUESTION POSTED AT 23/02/2020 - 11:22 PM

CPR, or cardiopulmonary resuscitation, is a first-aid technique to help save lives. It involves compressions of the patient’s chest cavity. Which description is the best description of the functions of chest compressions in CPR?

Compression-only (hands-only or cardiocerebral resuscitation) CPR is a technique that involves chest compressions without artificial ventilation.[6]:S643 It is recommended as the method of choice for the untrained rescuer or those who are not proficient because it is easier to perform and instructions are easier to give over a phone.[6]:S643[32]:8[36] In adults with out-of-hospital cardiac arrest, compression-only CPR by the lay public has a higher success rate than standard CPR.[36]

ANSWERED AT 23/02/2020 - 11:16 PM

QUESTION POSTED AT 23/02/2020 - 11:16 PM

Where in the body can you find connective tissue?

Connective tissue is based up off of four different types of cells 1) adipose which is fat 2) dense fibrous which makes up cartilage ligaments and tendons. Connective tissue is also found in 3) bone tissue which is your skeleton and 4) Vascular cells which is a component of blood.

so it's found through our the body in places like fat, tendons ligaments, cartalige, your bones, and in your blood. hope that gives you some ideas

ANSWERED AT 23/02/2020 - 10:57 PM

QUESTION POSTED AT 23/02/2020 - 10:57 PM

Breathing hard during exercise brings oxygen to your muscles, which helps the ___ process release energy to fuel your workout A) oxidation B) active transport C) diffusion

Answer: A) oxidation


Breathing is a vital metabolic process which avails oxygen to the body. During the process of exercise the muscles and other important cellular structures requires oxygen our heart pumps the blood faster so as to avail oxygen to all the parts of the body which requires oxygen. It also results in the oxidation of the food molecules which when breaks down result in the release of energy in the form of ATP. The energy in the form of ATP is used by the muscles which helps in workout.  

ANSWERED AT 23/02/2020 - 10:55 PM

QUESTION POSTED AT 23/02/2020 - 10:55 PM

The ancient fossils are a record of when shallow seas covered much of the United States. While the fossils are of organisms that are the precursors of many modern day organisms, changes in ocean geography and other factors eventually caused those older species to become __________.

-It is considered to be the link between the lobe-finned fishes and early ... Climate andgeography ... Sea levels were high with much of western North America under water. ... By the mid-Devonian, the fossil record shows evidence that there ... Plants, which had begun colonizing the landduring the Silurian ...

ANSWERED AT 23/02/2020 - 05:01 AM

QUESTION POSTED AT 23/02/2020 - 05:01 AM

The ability to roll your tongue is determined by a dominant gene (R) while recessive gene results in the inability to roll the tongue (r). A man and his wife can both roll their tongues and are surprised to find that thier son cannot. Explain this by showing the genotypes of all three persons

The genotypes of the parents would both be Aa or heterogeneous. Therefore, based on a punnet square, there is a 25% chance that the offspring would have the genotype aa or homogeneous recessive, which occurred. 

ANSWERED AT 23/02/2020 - 02:34 AM

QUESTION POSTED AT 23/02/2020 - 02:34 AM

What type of fuel makes up biodiesel

Biodiesel is defined as mono-alkyl esters of long chain fatty acids derived from vegetable oils or animal fats which conform to ASTM D6751 specifications for use in diesel engines. Biodiesel refers to the pure fuel before blending with diesel fuel.

i hope this helps you in the time of your need!! =D

ANSWERED AT 23/02/2020 - 01:43 AM

QUESTION POSTED AT 23/02/2020 - 01:43 AM

The burning of fossil fuels by cars and factories has most affected the ______________ cycle. A) carbon B) hydrogen C) nitrogen D) water

The answer would be A. Carbon

ANSWERED AT 23/02/2020 - 01:19 AM

QUESTION POSTED AT 23/02/2020 - 01:19 AM