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Movement is caused by __________________ of muscular tissue.

2. Muscle tissue requires a great deal of ________________ to do its work.

3. Proper _____________ is needed to keep muscles firm and strong.

4. The main sources of energy in the diet are _______________ and ____________

User IamIronMAN
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Question fours answer  is carbohydrates, fats or proteins
User AsymLabs
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