Question

1. 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 ____________.

Answer 1

I think number 3 is excersise im sorry if its incorrect

Answer 2

1.contractions
2.oxygen
4.carbohydrates and protein

i'm not sure about 3 sorry, hope this helps.