2. Explain the role of the smooth muscle sphincters and
the vascular shunt in a capillary network:

Explanation:

smooth muscle is where the exchange take place and the vascular shunt prevent the blood passing through when the demand of tissue is low

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.