Some dogs bark when trailing, others are silent. Barking while trailing (B) is dominant to the silent trailer (b). Erect ears (E) are dominant to drooping ears (e). How many pups from each phenotype would be expected from a heterozygous, erect-eared barker mated to a droopy-eared silent trailer

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient

In two sentences explain the differences of neutrophil and macrophage