What are the steps of muscle contraction?

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

We all have different forms of genes from our parent(s).what are these different forms called? a.alleles b.characters c.dna d.resources