Which of the following levels of organization within  the biosphere is characterized by biotic and abiotic factors? a. biome b. organism c. population d. community

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

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 type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic