The two lower thick walled chambers of heart are called _______.

The chambers of heart are separated by partition called _______.

The two lower chambers of the heart are called ..........

Non-motile, thick walled spores of algae are called

The upper chambers of the heart are called ventricles.

Two chambered heart is seen in ______.

______ are thin-walled upper chambers of the heart.

Two chambered heart is a feature of

Fill in the blanks : The upper chamber of the heart is called _______and the lower chamber is called____-