The fossil remains of animals with body plans recognizable as arthropods, echinoderms, mollusks, and other bilaterians first appeared during the _____ Period, around _____ million years ago.

Question

Quizplus · Accepted Answer

The statement specifies that the animals with body plans recognizable as arthropods, echinoderms, mollusks, and other bilaterians first appeared during a certain period and around a certain time. The only choice that matches both criteria is B, which states that these animals appeared during the Cambrian Period, around 541 million years ago.

The Fossil Remains of Animals with Body Plans Recognizable as Arthropods