I believe that the answer is an ecosystem
Answer:
C) acetylcholine
Explanation:
Acetylcholine is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle.
However, norepinephrine, gamma aminobutyric acid, and cholinesterase are not excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle.
The Rocky Mountains formed 80 million to 55 million years ago during the Laramide orogeny, in which a number of plates began sliding underneath the North American plate. ... Since then, further tectonic activity and erosion by glaciers have sculpted the Rockies into dramatic peaks and valleys.
Most of the present physiographic regions of the Great Plains are a result of erosion in the last five million years. Widespread uplift to the west and in the Black Hills caused rivers draining these highlands to erode the landscape once again and the Great Plains were carved up.
The part of the Human body that is most similar in function to the spongy mesophyll layer in a leaf is A) Alveoli in the lungs.
<em>B. Water; thirst</em>
Explanation:
Water is very vital for survival, even in animals such as dogs. Water is around 90% of blood, so as you can imagine it is very important to consume water regularly to not get dehydrated.
The feeling of thirst is a very important internal stimuli which makes us want to drink water, as our body is fueled on water along with numerous other things. If the water content in Spot's blood gets low, the body will set off a signal for him to get thirsty, which then leads to him getting up to find water.
This is just a way the body continues to work as great as it does, even in dogs! Internal stimuli signals like thirst, hunger, and the feeling of being tired keep our body in check.
