Need an in-depth/detailed answers and sources : 1. Why are top predators so rare and green plants so common in terrestrial ecological communities?

Need an in-depth/detailed answers and sources:

1. Why are top predators so rare and green plants so common in terrestrial ecological communities? Please provide examples of each to support your answer. 

2. Name at least two groups of organisms that do not fit the biological-species concept and describe why. Which species concept best fits the groups you have chosen and why? 

3. Describe how adaptive radiations develop. Please provide two examples to support your answer. Provide sources.

4. Why is there no single overall measure of biodiversity? Provide sources.

5. Compare microevolution and macroevolution, including evidence, examples, and the main proponents of each theory. Which concept has had a greater influence on the rise of biodiversity? Provide sources.