What component of Earth’s atmosphere exists entirely as a result of photosynthesis?
Oxygen is the component of Earth's atmosphere that is existed entirely as a result of photosynthesis. Photosynthesis is a procedure that plants and other different organisms use sunlight to make their food. It is a chemical procedure.
Answer:a sperm or a egg has an average of 11 chromosomes. both sperm and egg combine together would create 22 chromosomes. the average number of a normal human cell.
