Ascientist is studying the population decline of cheetahs in africa and the middle east over the past several decades. which best describes this situation? a conservation biologist observing artificial selection an evolutionary geneticist observing a migration process a conservation biologist observing an evolutionary process an evolutionary geneticist observing an environmental problem

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