A volcano is tall, cone-shaped, and made up of alternating layers of lava and ash. A wide, gently sloping mountain formed by thin layers of lava that pour out of a vent and harden on top of previous layers is known as a volcano. Ash, cinders, and bombs build up in a steep pile to form volcanoes.
The answer would be A. When supply exceeds demand
This is because there is plenty supply for the forest without animals dying from things such as, lack of food.
When demand exceeds supply it throws an ecosystem off because some animals aren't getting the food they need and therefor dying. So that eliminates answers C. and D.
When supply and demand are both 0 that means that there are no animals to demand and there are no supplies for demand leaving no sustainable ecosystem.
The calcium that triggers muscle contraction is stored in synaptic vesicles called endoplastic reticulum. that is not the only function of the endoplastic reticulum it is also a network of a membranous tubules within the cytoplasm of a eucryotic cell continuous with the nuclear membrane.
Answer:
density dependent
Explanation:
think of it like this, if there are too many people around there is a far higher chance of getting sick people need elbow room.