Answer:
to remove carbon dioxide from the body
Explanation:
I am pretty sure that's the right answer.
The second graph presented in the image below shows the survivorship of whales.
As we can see, the population grows rapidly after the calves reach adulthood, but the environmental factors limit the growth of the population and the population growth reached a plateau after a period of intense growth.
If you look at Cosmos episode 1, I'm sure you find an answer there.
Nucleotide!
When attached in a polymer, they become a nucleic acid.