9. Which do you consider more convincing evidence, DNA or physical features? Why?

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

If the frequency of the p allele is .63 in the population then what is the frequency of the q allele?

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.