Natural selection acts upon

a only recessive alleles
b alleles that are expressed
c only alleles that are the result of recent mutations
d only dominant alleles

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

b ti isnfornopgnoernfrof

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.