if an organism shows the dominant trait, can you tell just by looking at what its genotype is? and why

you cannot tell exactly what it's genotype, but you know it's one of two genotypes.

Explanation:

if the organism has the dominant trait it can either be Bb or BB.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

the answer is d.) homologous; have mammary glands