Earth Evolution

Requirements:

Suppose the impact 65 million years ago had not occurred. How do you think Earth would be different? For example, do you think that mammals still would eventually have come to dominate Earth? Would people be here? In addition, based on your own opinion of how impacts threaten Earth, how much money and resources do you think should be used to alleviate it? What types of programs would you support? (Examples include program to search for objects that could strike Earth, to develop defenses against impacts or to build actual defenses.)

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