In what order do these three organ systems of the human body operate during a reflex arc in response to a stimulus of sharp pain to the hand?

What is thought to have caused the mass extinction at the end of the cretaceous period?

If water were a non polar molecule, how would its properties be different ? a.) water would be a much lighter molecule b.) water would be able to climb up inside plants c.)water would not be able to form hydrogen bonds d.) water would stick together much more strongly

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above