The kidneys and sweat glands both work to prevent excesses of either uric acid or urine in the body. either water or salt in the body. either carbon dioxide or oxygen in the body. either feces or ph levels in the body.

Either water or salt in the body

Explanation:

Function of kidneys is to produce the concentration or dilute urine according to the hydration level of body as well as to maintain the electrolyte level (level of Na, K, calcium and bicarbonate ions) of blood.  Similarly, sweat glands serve to maintain the water-salt level of body by release of excess water and salt from the body in form of sweat.

spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.