after 70 years of absence, the gray wolf was reintroduced to yellowstone national park in 1995. after 1995, the elk population, which had been exploding, began to decline in numbers. willows and aspen trees began to grow more abundantly on riverbanks. the beaver population began to increase, and songbirds were more abundant in the grasslands and riverbanks. what is the most likely explanation for these events after the wolf was reintroduced?

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

What are the questions