The capability of both leptin and cholecystokinin in which they
have a similarity when a person has decreased its food intake. A leptin is a
way of helping an individual to regulate energy in means of having to inhibit
its hunger while the cholecystokinin is responsible for having to stimulate
digestions.
Mutation causes Genetic Variation in virus or any other organism !!
so D is your answer !!
B) THE green revolution bettered the environment.........
Southern White-faced Owls feed on large insects, spiders, scorpions, small birds, reptiles and small mammals. This owl hunts from a perch, dropping down and gliding low over the ground before swooping up to a new perch. Prey are normally taken from the ground or from branches, held with the powerful talons and torn apart with the bill.