A human skin cell has 46 chromosomes, and a sperm cell has . A. 1
B. 23
C. 92
D. 46

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

The cell membrane controls what enters and leaves the cell. which of the structures in the diagram below is the cell membrane? — f оооо

Which example best describes a reflex action? a. eating food when hungry b. coughing when the throat is irritated c. bending down to lift a heavy object d. going for a walk outside