The system aids the digestive system by secreting hormones which regulate how much we eat and how quickly food and nutrients travel through the digestive system. cardiovascular endocrine integumentary nervous

i'm gonna put a couple so you can chose from

explanation:

if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.

if either parent mouse passes a dominant allele, the offspring will have black fur.

if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)

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the answer is d.) homologous; have mammary glands