Answer:
It is true that studying natural selection in the fields can be challenging. Some of the challenges which Darwin might have faced could have been:
Darwin was only studying one trait for his results. But there might have been many other factors or traits affecting natural selection.
Natural selection does not happen rapidly hence Darwin would have had to wait for many generations to observe the results.
The environment is not such an easy factor to study. It is complex. It might have happened that the environment might have changed before any changes were seen in the population of the birds.
<u>Answer:</u>
<em>They are both needed for the synthesis of larger molecules.</em>
<u>Explanation:</u>
Sugar and amino acids are the building block for the molecules in our body. They have the greatest contribution combined to form the larger molecules. Amino acids are the building block of protein in the body.
Sugar and amino acids are very essential for the formation of larger molecules, protein synthesis and hormonal procedures. Sugar is the energy house of our body, it is transformed into the usable energy in the body.
The greatest surface area for gas exchange is found in the Alveoli
The s phase is when each chromosome has been duplicated.
I hope this helps :)
I actually failed Biology, but my guess is Puberty.
