Sorry if I am wrong ! I think the answer is A
"A gene pool consists of all genes, including all the different alleles that are present in a population. Number of times an allele occurs in a gene pool compared with the number of times other alleles occur. In genetic terms, evolution is any change in the relative frequency of alleles in a population."
The answer would be ecosystem.
- I hope this helps! (:
Answer:
is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
Explanation:
Its called the independent variable I think.