On Fermi's Paradox

Dr. Enrico Fermi did humanity and science a service by giving us a modality to think about these questions regarding possible alien civilizations or the lack thereof: "Fermi's Paradox." At my peak, while studying this in a university Cosmology class, high up in the Science building, I took on this question in terms of astronomy, chemistry, and mathematics. I turned in probably the best version as a final project and I don't have it currently; But I've done more recent work, and my reply stands. The answer to Fermi's query is that the universe is full of earth-like planets with water and primitive plants and beasts, but intelligent, tool-bearing life while existing in the universe due to the sheer statistics which I've worked out previously and I can't do again here due to health issues, intelligent life is extremely, extremely rare due to the extreme coincidence of how human evolution transpired. This means that in having the clever, nimble, and tool-bearing intelligence we have: Humanity has a great treasure, we must protect Earth; and we must carry forth into an opportune, welcoming Cosmos.