I looked it up and it should be D. Nerve cells :)
It prepares to fight danger or run from it. It identifies the primary source of danger.
Answer:
D. Smoke from a fire
Explanation:
Smoke from a fire is the correct answer because it is made up of physical atoms. Sounds, light, and temperature are not made of atoms and are thus not matter.
Green, like grass and trees...?
During active transport, the sodium pumps would transfer the solutions opposite the concentration gradient. This means that it would go from Solution A to Solution B
