Question

within the phylum arthropoda, which of these classes includes organisms with eight legs and were some of the first terrestrial carnivores on earth? arachnids insects

Explanation:

Arachnids (class Arachnida) are arthropods with eight legs. Many early arachnids were terrestrial carnivores, preying on other small organisms. Insects (class Insecta) have six legs, so they don't match the eight - leg criterion. Thus, the class with eight - legged organisms that were some of the first terrestrial carnivores is arachnids.

Answer:

A. arachnids