1) By human exhaling, cow exhaling, burning fires, horse exhaling, and sheep exhaling.
2) Decomposers reintroduce carbon into the environment.
3) Humans add carbon dioxide into the environment by burning fossil fuels.
Answer: c.
Explanation: Since there are two parents the allele will have two genes. One from each parent.
Blood types are determined by the presence or absence of two antigens
hope this helped
Grouping students based on their average marks in the previous year's final exam