Wednesday, January 14, 2015

Spider Exoskeleton


Our bones are on the inside of our body, and surrounded by muscles and fat and skin.

Spiders have their bones on the outside of their body, just like a big shell.
That is called an exoskeleton. Exo means outer.

Our skeleton on the inside is called an endoskeleton. Endo means inner.

A spider's exoskeleton is very hard and protects their heart and lungs and brain from getting hurt.

(from: wikipedia - spider)


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