I guess the answer is A,it may help you
Answer:
the food web
Explanation: A food web is a conceptual model that represents the flow of energy through an ecosystem.
10-100 million metric tons of carbon move through the slow carbon cycle every year.
Nucleic acids are made up of nitrogen bases, sugars, and phosphates.
<span>Alleles are each of two or more alternative forms of a gene that are found at the same position in a chromosome. Traits on the other hand, are the characteristics that are defined by genes. So the combination of alleles for a gene is what manifests itself into a trait.</span>
