Type of symmetry in which body parts are arranged in a circle around a central point is called radial symmetry.
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This type of symmetry is characteristic for the sessile animals like Cnidaria and Echinodermata. Organisms with radial symmetry have no left or right sides, they have a top and a bottom surface, or a front and a back.</span>
Answer:
Height above a given level
This is the excretory system
Answer:
D . It enables organs such as the heart and stomach, to slide across cavity walls and each other without friction
Explanation:
Serous fluid is a yellow transparent liquid which is usually found in body cavities. The serous fluid serves as a lubricant to prevent internal organs such as the heart, lungs and so on, from being rubbed against each other.
