C all the others are included in history
D I’m not sure but I hope this helps
Answer:
Wolves are animals who usually eat dead animals, so they clear the forests of dead corpses. When wolves were brought back to the park, they not only killed elk, but also changed their prey's behavior patterns. The herbivores started to avoid areas like valleys and gorges where they could be easily hunted by predators. Deer and elk populations increased substantially, resulting in overgrazing, particularly of willows and other vegetation important to soil and riverbank structure, leaving the landscape vulnerable to erosion. Without wolves, the entire ecosystem of the park suffered.
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A rising population helped the industrial revolution because it provided a large work force for the factor but it lead to pollution. ... The cotton Gin was aided to the textile industry and was invented Eli Whitney.
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Lincoln urged those freed by the proclamation to "abstain from all violence, unless in necessary self-defense" and to "labor faithfully for reasonable wages.
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