Answer:
stomata
Explanation:
Structures in plant leaves that open and close to maintain homeostasis are stomata.
B because after a workout you are already pretty stretched so regular ones won't cut it you will have to do intense ones to get a good stretch
Answer:
Adenosine.
Explanation:
Adenosine is a neurotransmitter that is created in the brain and when it binds to the adenosine receptors, it slows down nerve activity and it creates a sensation of drowsiness.
<u>Caffeine</u> looks like adenosine to the receptors, therefore, when we have caffeine, <u>it binds to these receptors and there is no room left for the adenosine to bind</u>. However, the caffeine doesn't slow down nerve activity but, in the contrary, it speeds it up.
Therefore we can tell that caffeine blocks the receptors for the adenosine thus promoting wakefulness.
Is it a question?or a true or false
