How do muscles obtain their oxygen.

Answer the following questions: How do metals react with oxygen ?

Answer the following questions: How do nonmetals react with oxygen?

Smooth muscles are

Answer the following question in one sentence : How do non- metals react with oxygen? Explain with an example.

Bend your arm at elbow. Observe the muscles in the front and the back of the arm. Straighten the arm and observe the same muscles again. Do the same with your leg folding it at the knee joint. Did you experience the contraction and relaxation of muscles at every movement?

Answer the given question in one sentence : How many types of muscles are there? Which are those types?

How do plants get rid of their excretory products?

How do organisms meet their energy requirement?

How do plants use carbon as their food source?