This has been reduced in size usually over time and has less important functions in some related organisms than in others

Vestigial organs

Explanation:

Vestigial organs are organs that that were once functional in the evolutionary past but ceased to function or have reduced in function over time.

Due to continued disuse, this organs ceased to function or adopted to less important functions.

A good example of a vestigial organ is the Appendix in the human body, as the argument goes; the appendix is a tail that reduced in size with time due to disuse.

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.