Anything that doesn't have to to with the living organisms or life in that sphere such as a rock or the dirt. It would help if you posted options. :) hope this helped
They are collagen fibers, reticular fibers, and elastic fibers.
<span>Serotonin and norepinephrine are the types of neurotransmitters that are released.
REM sleep is the rapid eye movement sleep and mostly it occurs after 90 minutes when you sleep and at that time specific brainstem neurons have their activity reduced and you can also have intense dreams in that time period. There are also stages during rapid eye movement sleep.</span>
Answer: students drinking coffee
Explanation:
The dependent variable is the one that DEPENDS on what is about to happen. In this situation, whether the students scored higher DEPENDS on if they drank coffee.
So the independent variable would be the fact that they drank coffee.
Hope this helps!
