They come from the atmosphere, since plants use carbon dioxide to produce carbohydrates :)
As motion accelerates it produces heat, as heat of an object increases or decreases, affects its potential to be moved
Answer:
A nerve impulse
Explanation:
It's important to note that these signals not only connect the brain and spinal cord, but they also send signals to muscles and glands. People talk about nerve impulses when they talk about the electrical signal that goes down an axon.
Answer:
B.soil that is frozen solid all year
C.summer thaws combined with frozen permafrost
D.the overflow of a large lake each summer
