The choices for the above question are:
a.single gene-pair inheritance.
b.shared environmental influence.
c.gene-environment interaction.
d.polygenetic inheritance.
The concept which is defined is gene-environment interaction. The answer to your question is C. I hope this is the answer that you were looking for.
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.
elimination of water or some other simple molecule. The combination of two identical molecules is known as self-condensation.
D. a cause might be the increase of survival rate of the long-legged ponies.