I would say shape, hardness, and texture
C. Sperm is produced in a male organism by meiosis
Scientists most often produce new genetic variations of organisms by causing mutations with radiation or chemicals and then selectively breeding in order to emphasize the desired traits in the new variations. The Dachshund is an example of this. By breeding two dogs with a similar mutation that caused student legs and elongated backs breeders were able to create a new variation not found in nature.
Explanation:
respiration because it's about blood circulation
