Question

Animals have two major types: _____. aquatic and terrestrial, vertebrates and invertebrates, coelomates and acoelomates, sexual and asexual.

Answer 1

vertabrates and invertabrates

Answer 2

The correct answer is the second option. Animals have two major types: vertebrates and invertebrates. Vertebrates are animals that have backbone while the invertebrates do not have one. Examples for vertebrates are birds and mammals while the latter are insects and squid.