Which actions are functions of the circulatory system? Select four options.

delivers nutrients to cells
brings carbon dioxide to cells for use
protects the body from pathogens
removes waste materials from cells
helps cuts and wounds to heal

Which statements correspond to cellular respiration? co2 diffuses passively into the cell. co2 diffuses passively out of the cell. co2 must be pumped out of the cell. o2 diffuses passively when produced inside the cell. o2 diffuses passively when converted to co2. o2 is pumped in and forces co2 out.

What is the next step in the process after a substrate enters the active site of an enzyme

Which characteristics are typical of a human population in the postindustrial stage?