MCQOPTIONS
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| 1. |
Muscles must have something rigid to pull against if they are to cause movement. In case of humans, the rigidity is supplied by ____; in the case of earthworms, the rigidity come from???. |
| A. | A hydrostatic skeleton; an endoskeleton. |
| B. | Opposing muscles; an exoskeleton. |
| C. | An exoskeleton; an endoskeleton; |
| D. | An endoskeleton; a hydrostatic skeleton. |
| Answer» E. | |