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.
<span>it comes and goes through the madreporite - a small valve like structure</span>
A mouse has a greater ratio of surface area rather than a hippopotamus.
Answer:
B. Mitigating problems associated with rising sea
Explanation:
