A phylum with true coelom is

Why is the true coelom considered a secondary body cavity?

A: Echinoderms are the only radially symmetrical animals with true coelom. R: Echinoderms have secondarily adapted to radial symmetry.

A: Echinoderms are the only radially symmetrical animals with true coelom. R: Echinoderms have secondarily adapted to radial symmetry.

Find out the false statements and correct them by changing only underlined words: Earthworm has true coelom and is hermaphrodite.

Ascaris is characterized by (a) Absence of true coelom but presence of metamerism (b) Presence of neither true coelom nor metamerism (c) Presence of true coelom but absence of metamerism. (d) Presence of true coelom and metamerism.

In the course of evolution, the true coelom appeared first in

In the course of evolution, the true coelom appeared first in

In the course of evolution, the true coelom appeared first in