Joel is comparing two slides showing chromosomes in a sperm cell and a skin cell of a dog.  he finds that the sperm cell has 39 chromosomes. how many chromosomes can he expect in the  skin cell?

What causes darkening of the skin as melanin production increases

Which of the following is a common response to cell signaling?

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d