B cells a. sometimes remain in the blood for years
b. secrete antibodies
c. are stimulated by helper T cells.
d All of the above

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

Which organism can most likely be classifild as domain bateria

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous