Are most animals vertebrates or invertebrates? How does bilateral symmetry differ from radial symmetry? What is...

Are most animals vertebrates or invertebrates?

How does bilateral symmetry differ from radial symmetry?

What is cephalization?

Expert Solution

Answer-

most of animal species are invertebrates.
More than 95% animal species are invertebrates.
Invertebrates are especially important as agricultural pest and parasites.
Invertebrates acts as good for human and are main element in food chain of birds, fish, and many other vertebrates.
Example of invertebrates are - sea star, sea urchin, earworm, crabs, spiders, sponges, jellyfish.
Invertebrates distributed between more thank 35 phyla .however vertebrates are distributed only single phylum Chordata ( phylum chordata also contain some invertebrates)
There are currently around 65000 known apecies of vertebrates. This sound like a lot , but this is more less than invertebrates.
Except Chordata all animal phyla consist of invertebrates.
So most animal species are invertebrates.

DIFFERENCE BETWEEN BILATERAL SYMMETRY AND RADIAL SYMMETRY-

CEPHALIZATION-

animals with bilateral symmetry have a definite head.
Cephalization is the concentration of sense organs and nerve cells at the anterior end or front end of the body.
Animals with bilateral symmetry exhibits Cephalization.
Animals with this trait tend to respond in more complex ways to their environment.

gladiator answered 1 year ago

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