It is a cavity between the body wall and the gut wall.

Aristotle classified animals into two groups based on the presence or absence of $RBC$. The group which does not have $RBCs$ is:

The coelom produced by the splitting of the mesoderm is known as:

In diploblastic animals,what is present between the two germ layers?

The figures below represent diploblastic and triploblastic organization. Identify the correct labels for $P$ and $Q$.
$\quad\quad P \quad \quad Q$

What is the basis of animal classification?