Read the sentence. many spider and insect species build nests, as do some species of fish, amphibians, mammals, turtles, lizards, snakes, and crocodiles. which identifies the subordinate clause in this sentence? many spider and insect species build nests as do some species of fish amphibians, mammals, turtles, lizards, snakes, and crocodiles as do some species of fish, amphibians, mammals, turtles, lizards, snakes, and crocodiles

The subordinate clause in this sentence is "as do some species of fish, amphibians, mammals, turtles, lizards, snakes, and crocodiles."
A subordinate clause is one which is dependent and cannot exist on its own - it has to be located within a larger, independent sentence to make sense. A is incorrect because that is the independent clause, B is incorrect because that is not the complete subordinate clause, and C is incorrect because there is no verb so it cannot be a clause but rather a phrase.