A person has type B blood. What are ALL the possible blood types of his parents. Show the crosses to prove your answer.
please hel!!!

As a small change in a person's dna can cause a genetic disorder

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.

Which of the following human activities resulted in the growth of the north american deer population?