Over many generations, a certain species of hummingbird has developed traits, including a small body, brightly colored feathers, a long, narrow beak, and the ability to drop its body temperature while it sleeps. which of these characteristics is most likely a trait that developed in response to available food sources?

Considering the answers;
A. small body
B. Drop in body temperature
C. Long, narrow beak
D. Brightly colored feathers
The answer would be C. long, narrow beak
The characteristics that is most likely a trait that developed in response to available food source is long, narrow beak.
These are examples of acquired traits, acquired traits are characteristic or traits that produces a phenotype that is a result of an environment influence. They are not coded for in the DNA of an individual and thus cannot be passed down to offspring during reproduction. 

Ithink the answer is nuclear membrane

They are all in a iving organism.