Which of the following is the best definition of a dominant allele?
a. the allele that is expressed only if the individual is homozygous
b. the allele that is expressed only if the individual is heterozygous
c. the allele that is more beneficial to the individual's survival
d. the allele that will be expressed over other alleles for the same trait

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.