Which of the following is an observation made by Darwin that supports his theory of natural selection? A. All organisms that are born survive. B. More organisms are born than can survive. C. Insects produce many offspring but produce few eggs. D. Insects never produce offspring.

QUESTION POSTED AT 03/12/2019 - 10:29 AM

Answered by admin AT 03/12/2019 - 10:29 AM

Correct answer: B). More organisms are born than can survive

The Darwin theory of natural selection states that living things with beneficial traits give more offspring than others. This causes a change in the traits of living organism over time.

More individuals are produced in each generation that can survive, there is a phenotypic variation among the population and it is inheritable. Those individuals that are better suited to the environment can survive and are able to produce offspring.

Hence, the correct answer would be option B.


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Related questions

Which statement correctly describes evidence that supports the theory of evolution? A. All known forms of life differ in their genetic makeup. B. All known forms of life share a universal genetic code. C. All known forms of life require oxygen for metabolism. D. All known forms of life depend on each other for survival.

A. All known forms of life differ in their genetic makeup. 

According to the theory of evolution, population of species have evolved into a better shape and form and with more adaptive characteristics over time. This change can only occur if there is genetic diversity in the population such that some members of the population with suitable characteristics will be favored over the rest and hence evolve into dominating members of the species. 

ANSWERED AT 14/12/2019 - 06:33 PM


QUESTION POSTED AT 14/12/2019 - 06:33 PM

A classmate states that mitochondria and chloroplasts descended from the same type of bacteria. Does the evidence support this? explain your reasoning

The endosymbiotic theory explains that mitochondria and chloroplasts descended from the same type of bacteria. Symbiosis is an interaction between two organisms of different species, and endosymbiosis is a type of symbiosis in which one organism lives inside the other one. According to the endosymbiotic theory, a host cell ingested symbiotic bacteria, which specialized into mitochondria or chloroplasts. The evidence for this theory is that mitochondria and chloroplasts, like bacteria, have their own circular DNA. They also have their own transcriptional and translational machinery.

ANSWERED AT 14/12/2019 - 06:30 PM


QUESTION POSTED AT 14/12/2019 - 06:30 PM

Fiona wants to use the scientific method to answer the question “Do oxygen levels in the air affect rates of photosynthesis?” She reads about photosynthesis in her biology book and is ready to carry out the next step. What should she do next? perform an experiment design a procedure make observations form a hypothesis

Design a procedure. 

The hypothesis is already mentioned to her about oxygen levels in air that affect rates of photosynthesis. once hypothesis is known, the next procedure is to design the experimental procedure. After this step, the person performs the experiment and makes the observations. 

ANSWERED AT 14/12/2019 - 06:27 PM


QUESTION POSTED AT 14/12/2019 - 06:27 PM

Which of the following best explains the natural cause of a decrease in biomass as succession peaks in a climax community? Select one: a. Once a climax community is reached, there are no nutrients left in the ecosystem to support the growth of plants. b. The canopy of forests prevents sufficient light from reaching the forest floor, thereby limiting primary productivity. c. Humans usually cut down old growth forests. d. The presence of large animals such as elk or wolves prevents the development of young animals.

A. Once a climax community is reached, there are no nutrients left in the ecosystem to support the growth of plants. Climax community is defined to be that community of plants, animals and fungi which have achieved stability through the process of ecological succession. Biomass decreases at this stage of succession because organic material released into the soil is not processed as quickly as before, and hence the decrease in amount of nutrients left to support the growth of plants. 

ANSWERED AT 14/12/2019 - 06:23 PM


QUESTION POSTED AT 14/12/2019 - 06:23 PM

Materials are transported within a single-celled organism by the ?

A single celled organism does not contain any specialized organelles and thus the transport of materials occurs through cytoplasm. Moreover, this transport is facilitated by the cytoskeletal fibres or microtubules within the cell which make it easier for the materials to be transported within the cell. 

ANSWERED AT 14/12/2019 - 06:22 PM


QUESTION POSTED AT 14/12/2019 - 06:22 PM

Some chemicals that are used to stop bug infestations do not kill the insects. instead, they keep insects from developing past the larva stage. explain how preventing these insects to develope past the larva stage could stop an insect infestation.

Simple. Larva can't reproduce. 
The insects who laid them are there. but they will eventually get killed off so all there is is larva and because larva can't reproduce you have no bugs.


ANSWERED AT 14/12/2019 - 06:15 PM


QUESTION POSTED AT 14/12/2019 - 06:15 PM

The study of Escherichia coli (E. coli) led researchers to new experimental designs for studying operons. Which experimental design did the scientists use? a. Use a microscope to observe cell division to determine the structure of operons. b. Test the response of E. coli to a variety of chemicals to determine the number of operons that are present. c. Insert the operons from one organism into another to determine the mechanism of operon expression. d. Read the genome sequence to determine the quantity and organization of operons.

D. Read the genome sequence to determine the quantity and organization of operons. 

The scientists used the technique to study operons in E. Coli by studying the genome sequence. This sequence would also tell the frequency of occurrence of operons in the sequence and where they are located and in which fashion are they organized. It is important to understand which genes are coupled up in the operon. 

ANSWERED AT 14/12/2019 - 06:10 PM


QUESTION POSTED AT 14/12/2019 - 06:10 PM

Imagine that a chromosome contains the following chromosome order: ZYXWVUT. What type of mutation happens to produce ZYXWWVUT? A. Inversion B. Duplication End of exam C. Deletion D. Translocation

B. Duplication

This is an addition of an extra base in the DNA by the process of duplication. One base is added twice instead of being added once. Due to the addition of this new base, there will be frameshift mutatiion and this could disrupt the entire amino acid sequence to be added to form protein. 

ANSWERED AT 14/12/2019 - 06:01 PM


QUESTION POSTED AT 14/12/2019 - 06:01 PM

Why is the natural greenhouse effect of Earth a cause for concern now?

Greenhouse gases, such as water vapor, carbon dioxide, methane etc., move in and out of the atmosphere. They trap some of the heat radiated out from the Earth that would normally move out into space. This is called the greenhouse effect. It is natural, and is caused by the earth's carbon and water cycles and the heat from the sun. Without this warming we would be a cold dead planet.  hope it helps

ANSWERED AT 14/12/2019 - 05:58 PM


QUESTION POSTED AT 14/12/2019 - 05:58 PM

The domain contaning organisms that are prokaryotic and unicellular

The domain that contain organisms which are prokaryotic and unicellular is called archaea. Organisms of this domain can survive in environment with low or no oxygen and can even survive in conditions of extreme temperature, salinity, pH, etc. They do not contain a nucleus but rings of DNA, also called plasmid. 

ANSWERED AT 14/12/2019 - 05:53 PM


QUESTION POSTED AT 14/12/2019 - 05:53 PM

What is the best description of the evolution of camouflage by natural selection?

Natural selection means that the individuals that are best adapted within a population are the ones that will survive.

ANSWERED AT 14/12/2019 - 05:52 PM


QUESTION POSTED AT 14/12/2019 - 05:52 PM

This element is prominent in both living organisms and in the Earth’s surface. a. oxygen b. carbon c. hydrogen d. silicon e. aluminum

B. Carbon Carbon is often called "The Element of Life" because it's found abundantly in all living and once living things

ANSWERED AT 14/12/2019 - 05:35 PM


QUESTION POSTED AT 14/12/2019 - 05:35 PM

Why might red blood cells be important to the normal function of the organism's body

Because red blood cells help u breathe and help u with ur heart and they need to be protected from white cells

ANSWERED AT 14/12/2019 - 05:34 PM


QUESTION POSTED AT 14/12/2019 - 05:34 PM

Which process increases genetic variation among whale offspring

Fertilization of egg cells increase genetic variation among whale offspring :)))
i hope this be helpful
have nice day 

ANSWERED AT 14/12/2019 - 05:22 PM


QUESTION POSTED AT 14/12/2019 - 05:22 PM

A group of organs that work together to perform a closely related function is called a(n) a. organ system. b. organism. c. tissue. d. cell

Answer: a. organ system

Organ is a group of tissues in a living organism that is adapted to perform a specific function in an organism. The group of organs is called as organ system. The organs work together to perform vital functions in the body of the organism such as digestion in humans performed by mouth, stomach, intestines and others organs.

ANSWERED AT 14/12/2019 - 05:07 PM


QUESTION POSTED AT 14/12/2019 - 05:07 PM

There are more hydrogen atoms in living organisms than any other atom, but oxygen is more abundant in terms of mass. Why is this statement true?

This statement is true because an oxygen atom has an atomic mass of approximately 16 atomic units whereas hydrogen atom has an atomic mass of 1 atomic unit. This means that one oxygen atom equals approximately 16 hydrogen atoms. Thus, even if hydrogen atoms are more than any other atom in living organisms, oxygen is more abundant in terms of mass.  

ANSWERED AT 14/12/2019 - 05:07 PM


QUESTION POSTED AT 14/12/2019 - 05:07 PM

A mutation occurring in a human can be passed from parent to offspring when it occurs in a (1) lung cell, due to exposure to a toxic gas (2) gamete formed in the ovary (3) body cell undergoing mitosis (4) heart cell with chromosome damage

2. Gamete formed in the ovary. 

Gametes of both parents are those cells which fuse to form the offspring, and hence any mutations occurring in the chromosomes of gametes can be tranmitted to the offspring depending on which gametes fuse. All other cells mentioned in options do not transfer any genetic information to offsprings. 

ANSWERED AT 14/12/2019 - 05:07 PM


QUESTION POSTED AT 14/12/2019 - 05:07 PM

Par-Tee Golf sells only golf-related goods, but it offers a huge selection of clubs, golf bags, and accessories. It has become the dominant seller of golf equipment in many cities. Par-Tee is a A. discount store. B. category killer. C. supercenter. D. natural monopoly.

B. 

Par-Tee is a category killer. A category killer is a type of business store which is dominant in its product category. It offers an extensive collection of merchandise at such low prices that smaller stores cannot compete. Category killers can compete successfully with other businesses by being bigger, cheaper and even being more popular. A good example of category killer would be walmart. which is a big-scale retail store. 

ANSWERED AT 14/12/2019 - 05:04 PM


QUESTION POSTED AT 14/12/2019 - 05:04 PM

Will cell theory ever become the law of cells?

Cell theory may not become a law of cells and there are many reasons to prove it and I have 4 reasons why.One is because the scientific community has never accepted cell theory as a law for many years . Another reason is cell theory is only describes the natural world and explains the natural world .My last reason is cell theory does not have enough support to be made into a law. Therefore, cell theory will never become the law of cells. Hope this helps :)

ANSWERED AT 14/12/2019 - 05:04 PM


QUESTION POSTED AT 14/12/2019 - 05:04 PM

Organism lacking enzyme--

The inability of an organism to produce certain protein can be when the organism lacks the enzyme needed to combine amino acids. 

Amino acids are the basic units of proteins. They are joined successively via peptide bonds to an elongating peptide chain such that several hundred to thousand amino acids join to form one protein chain. Hence, an organism which lacks the enzyme that facilitates the formation of peptide bonds will not be able to produce certain proteins.  

ANSWERED AT 14/12/2019 - 05:00 PM


QUESTION POSTED AT 14/12/2019 - 05:00 PM

Before translation can begin, mRNA leaves the nucleus and enters the ______. Select one: a. cytoplasm b. ribosome c. smooth ER d. mitochondria

B. ribosome

Ribosomes are the organelles where mRNA is translated into proteins. mRNA binds to ribosomes, where tRNA brings correct amino acids to be attached in the growing peptide chain. Hence, before translation can begin, mRNA have to be attached to ribosomes. 

ANSWERED AT 14/12/2019 - 04:50 PM


QUESTION POSTED AT 14/12/2019 - 04:50 PM

Which statement best describes the role of DNA in relation to RNA and proteins? a. DNA is made from RNA, which is created from proteins. b. Proteins are made from RNA, which is created from DNA. c. RNA is made from DNA, which is created from proteins. d. Proteins are made from DNA, which is created from RNA.

B. Proteins are made from RNA, which is created from DNA

DNA is the basic unit which contains all the genetic information of the cell. DNA is transcribed into RNA by RNA polymerase. This type of RNA is called messenger RNA, which goes into the cytoplasm to be translated into proteins. These proteins then control various activities of the cell, including DNA replication, cell duplication, etc. 

ANSWERED AT 14/12/2019 - 04:46 PM


QUESTION POSTED AT 14/12/2019 - 04:46 PM