18. If the inside & outside of a cell are both isotonic, does water still move across the cell membrane? Explain.

Yes

Explanation:

Isotonic means equally inside and outside the cell water can move out and in within not net movement.

In an isotonic environment, the relative concentrations of solute and water are equal on both sides of the membrane. There is no net water movement, so there is no change in the size of the cell

the correct option is option a

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.