Imagine that you travel back in time 600 million years and are looking at marine organisms. What types of skeletons would you observe in these creatures?

Question

Quizplus · Accepted Answer

During this period, the predominant forms of life were simple and primarily soft-bodied, which is consistent with organisms having hydrostatic skeletons and exoskeletons. Endoskeletons, like those found in vertebrates, had not yet evolved.

Imagine That You Travel Back in Time 600 Million Years