University of Arizona Ecological Research Keystone Species Discussion

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I need help with a Environmental Science question. All explanations and answers will be used to help me learn.

you are going to watch a video 20 minutes long provides some in-depth details about ecological research behind the concept of a keystone species. You are going to answer 4 questions after you watch the video . 

 Please watch the video and answer the following questions:

1) Describe the difference between “bottom up” and “top down” controls on a food chain. How does this relate to the “green world hypothesis”? 2) Why was Robert Paine throwing starfish into the ocean? How did the results of his experiment help to demonstrate the idea of a “keystone species”? 3) What is the role of sea otters in regulating the marine kelp ecosystem of the Pacific Ocean? How does this relate to the idea of trophic cascade?4) How did 20th century Pacific whaling further demonstrate the trophic cascade hypothesis?

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