The answer would be that the e<span>xcretion and the </span>liver<span>. Excretion in mammals. Excretion is the removal of potentially harmful or toxic substances from the </span>body<span>. These substances are usually waste materials </span>produced by<span> complex chemical reactions taking place in living </span>cells<span>. Enzymes catalyse the reactions.</span>
Protects the plant from losing water. The sharp needles of the tree mean that is has less surface area for the sun to make contact. They may also have differently shaped stomata, in order to prevent water loss
Very powerful microscopes were needed before cells could be observed in detail
