D is the best answer. Hope this helped :)
Complete question: What situation might develop in a population having some plants whose flowers open at midday and other plants whose flowers open late in the day?
a. Temporal isolation
b. Geographic isolation
c. Behavioral isolation
d. Genetic drift
Answer:
a. Temporal isolation
Explanation:
Temporal isolation is one of several mechanisms of reproductive isolation. Temporal isolation occurs when some organisms of a population exhibit different timing of reproductive maturity. It also occurs when some members of a population reproduce at a different time from the others. This does not allow interbreeding between them.
When plants of a population open flower at a different time of day, cross-pollination would not occur between these plants. This represents temporal isolation.
Your nerves go into your bone, I know it sounds crazy but its true, your Skeletal system is mixed with your nerves, it helps you function, without your nerves going into your bones we couldn't be able to feel if a bone is hurting or if you are getting hurt without your nerves you couldn't feel pain your nerves help you feel pain and where the pain is coming from.