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Mass extinction event by 10 KM asteroid impacting the Earth allowed for the rise of modern mammals in unique ecosystems and niches
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most prevalent large animals to ever wander pangea offer great diversity in shape and size and even take to air and sea.
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Oceans are brimming with life and transition forms such as tiktaalik invade the land yet maintain fish characteristics as well
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protozoans and their predatory feeding leads to complexity and efficiency in organisms and their energy production
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Arises from symbiotic event and becomes specialized organelle
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2400-1400 O2 gas made by the cyanobacteria accumulates in atmosphere laying the foundation for the first critical element to support life for energy transformations
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1400-2000 Mitochondrion arises from symbiosis with bacteria triggering multicellular and increased complexity of organisms
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stromatolite form as older generations are replaced by newer ones providing the earliest physical evidence of life on Earth
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early rock samples of organic compounds show low Carbon 13 indicating age is VERY old!
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