Hello all my steemit friends, hopefully we are in good health always and always success, in this post I will tell a little about shell:
Shellfish is a nutritious and useful food good for health, shellfish is also divided into several classes,
shells have a pair of shells that are usually symmetry of a mirror connected to a (connective tissue). In most shells there are two adductor muscles that regulate the open-lid of the shell.
Shells have no head (also brains) and only the eyebrows have eyes. The organs are kidney, heart, mouth, and anus. Shellfish can move with "feet" in the form of a flattened organ expelled from the shell at any time or by opening the lid of the shell in a shock.
The circulation system is open, meaning it has no blood vessels. The supply of oxygen comes from the very liquid blood that is rich in nutrients and oxygen that surrounds its organs.
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