Which are protostomes?
a. worms
b. horses
c. flowering plants
d. humans

A. Worms

In most, but not all protostomes, the mouth forms first, then the anus, whereas the reverse is true in deuterostomes. Only the worm is like that

sexual reproduction produces offspring with novel combinations of genes. species that reproduce sexually must maintain two different types of individuals, males and females, which can limit the ability to colonize new habitats as both sexes must be present.

you know they are heterozygous for a trait because they have it as jj or jj.