The neurons in michael's arm just sent a neural impulse. it will be 1–2 milliseconds before another neural impulse can be generated. this brief time period, when another neural impulse cannot occur, is called the

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Asmall population of chimpanzees lives in a habitat thant undergoes no change for a long period of time. how will genetic drift affect this population

Most of the carbon on earth is stored in the form of