The term fish is used for any any swimming vertebrate with fins. it includes a diverse group of animals, divided into four taxonomic classes, agnatha, chondrichthyes, osteichthyes, and placoderma. taxonomists first divided all "fish" into two classes, agnatha and placoderma. the placoderma are considered ancestors of all other fish. what fossil evidence taxonomists separate all "fish" into these two branches for classification?

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.

its temperature is increasing. this causes molecular vibrations to increase.