There are two types of american rat terrier dogs those without hair and those with hair the presence of hair is a genetically determined trait. some female rat terriers with hair produce only puppies with hair, whereas other females produce rat terrier puppies with put hair. explain how this can occur

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood