Answer: Determined by genetic and environmental factors.
Explanation:
Are determined by genetic and environmental factors and the interaction of such factors, but not with absolute certainty. This development system model includes both influences of species typical genes and the influences of a species typical rearing environment. Relatively rapid increase in obesity, the change stems from changes in the environmental context.
You could buy 1 bigger sheep and breed it with a smaller one :D
hope this helps
Answer is B. The length of a day on mercury is much longer than Earth