Question

Fill in the blanks.
1. The mouth of cnidarians is surrounded by a number of finger-like projections called
2. The tough outer covering on the body of arthropods is called
3. The entire body of Mollusca is covered by a fold of thin skin called
4. In Pisces, the heart is
chambered.​

Answer 1

Explanation:

$\huge{\fcolorbox{white}{pink}{Answer:-}}$

The mouth of Cniderians is surrounded by a number of finger like projections called Cnidocils.

Their bodies are protected by an tough cuticle made of proteins and chitin, a polysaccharide with added nitrogen groups. A cuticle is a tough outer layer of non living organic material. The cuticle of arthropods acts as an exoskeleton.

The mantle (also known by the Latin word pallium meaning mantle, robe or cloak, adjective pallial) is a significant part of the anatomy of molluscs: it is the dorsal body wall which covers the visceral mass and usually protrudes in the form of flaps well beyond the visceral mass itself

Pisces are aquatic animals, they belong to phylum Chordata, their heart is two-chambered, one auricle and one ventricle and there is the mixing of pure and impure blood takes place

Answer 2

Explanation:

1.

2.

3.

4.