What percentage of human sperm cells carry an x chromosome?
a. 0%
c. 50%
b. 25%
d. 100%

Acquired mutations can result from radiation pollution toxins inheritence select all that apply

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.

Construct at least two possible hypotheses for the student’s experiment.