In the context of sensory receptors, the intensity of the stimulus is communicated to the brain by varying the of the action potential sent to the brain.

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point