The body structures in a population of hawk moths (a species of moth we have here in New Orleans) were stable for a long time. Then, their body structures changed. Their proboscis, which is used to suck nectar out of flowers like a straw, got much longer. Why did this happen? A. The hawk moth population wanted to have longer proboscis.
B. Body structures naturally become longer over time.
C. Their environment must have changed, requiring them to have long proboscis to survive.
D. It is impossible to say without more information.