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A bear has an ___________ that is inside its body. Its skeleton is made of bone and cartilage, not of ____________ like a grasshopper's. When the bear moves its forepaw toward it using its bicep, the bicep is called the ___________. \

What words fill these spaces correctly, in order?

Endoskeleton, Chitin, Prime Mover


Endoskeleton, Chitin, Agonist


Exoskeleton, Chitin, Prime Mover


Inskeleton, Chitin, Origin

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mariahbarlow10
From what I can tell, The answer is either A or B. Mammals have what is called an Endoskeleton, which means that their skeletons are inside their bodies. A way to remember this is Exo- is similar to exit and when you exit something then you are going outside. Endo- sounds like into, which can relate to being on the inside. Insects have Exoskeletons, which are made from Chitin. Now Agonists are also called Prime Mover muscles, which means they are practically the same thing.

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