Scorpion, shark, and bat exhibit which type of body symmetry?

Organisms attached to a substratum generally possess:

The chart for animal classification is given below. Identify the correct names for $P, Q, R$ and $S$.
$P\quad Q\quad R\quad S$

Write a short note on: Coelom.

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

$A$ coelom is a