Why did the removal of wolves affect the entire Yellowstone ecosystem?
O
A. It changed the balance of many different interactions,
O
B. The organisms in the ecosystem did not compete for resources.
O
C. The wolves were the only producers in the ecosystem.
O
D. Wolves were the only predators in the ecosystem.

B. The organisms in the ecosystem did not compete for resources

Explanation: The wolves are the keystone species of the Yellowstone ecosystem. They prey on other organism, hence, maintain a balance in the forest. in case, the wolves are removed, the animals, which are the prey of the wolves would increase, which may lead to increase in competition and exploitation of the resources and eventually an unbalanced ecosystem.  Hence, the wolves are very important to Yellowstone.

protistas excret ethanol used in the manufacture of vinegar

yes, because even though a theory has a  lot of evidence to support it, it is not always true