The structure that prevents backflow of blood into the left atrium is the

The following statement about pathogens are true except for one, which statement is not true? a. pathogens belong in the human body b. pathogens can cause infectious diseases c. some pathogens can be classified as animals d. pathogens can multiply inside a host organism

Energy needs, in total kilocalories per day, are greater during than any other time of life. a.childhood b.infancy c.adulthood d.adolescence

Amino acids are important to the body because they build carbohydrates proteins complex carbohydrates simple sugars fats