Answer:
B. Brain stem
Explanation:
The brain stem controls basic body functions such as breathing, swallowing, heart rate, blood pressure, consciousness, and whether one is awake or sleepy.
<span>The two populations of donkeys will remain physically identical in both areas.</span>
It is because he knew, that was a good breed of plant (High variety)....so he did not want to waste that gene's capacity by hybridization with some other factors....
The severity of the tradeoff between parental care and other activities may depend on environmental conditions. For example, if there is a lot of food available, parents may spend more time tending their young because finding food for themselves takes less time and energy. (Hoping that helps)