What does the t stands for in t-cells?

Environmental differences within ecosystems are generally caused by

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

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.