Which of the following is formed when a group of tissues works together to perform a common function?
a. brain
b. organ system
c. body
d. organ

Which type of stimulus do mechanoreceptors detect? sound pain heat light

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil

To test the responsiveness of the kidneys, scientists have designed an experiment tracking urine output of people during a normal day, while regulating the in-take of water by mouth. what would be an appropriate hypothesis for this experiment?