With a rigid exoskeleton how does an arthropod grow

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1.In the contraction of muscle, what role does ATP play?

2.What is muscle tetanus? .

3.With a rigid exoskeleton how does an arthropod grow?

4.In aquatic gas exchange across gills, how does countercurrent exchange improve the uptake of O2 that otherwise would be lost with concurrent exchange?

Reference no: EM13112703

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