Which of the following happens first within an animal response?
a. interneurons receive and process information about the stimulus.
b. sensory neurons sense a stimulus.
c. motor neurons carry directions from interneurons to muscle cells.
d. sensory neurons pass information about the stimulus to other nerves cells

The correct answer is B. Sensory neurons sense a stimulus. The neurons first have to sense the stimulus before they are given the chance to process it. Then these neurons send the message about it to other neurons that react to the stimulus and then they send it to others and so on and so on until you've received it, fully processed it, reacted, and then it's over.

The Mitochondria

This is were ATP (aka energy for the cells) takes place.