help me to answer questions in ecology

No more than 4 sentences answer the following questions. 2 or 3 sentences is better.

1. Living earth： Find evidence that organisms helped shape the environment on earth

2. Marine Life: Which predator has evolved to feed exclusively on oysters? Think about this in an optimal foraging context. How might this animal be limited to maximizing a trade-off between searching and handling food? (I will give information to answer)

3. New England Forest: Do you think these Amphibians in New England Forest are R-selected or K-selected organisms? why?

 

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