Cell evolution

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  • Fossil records indicate that eukaryotes evolved from prokaryotes somewhere between 1.5 to 2 billion years ago. Two proposed pathways describe the invasion of prokaryote cells by two smaller prokaryote cells. They subsequently became successfully included as part of a now much larger cell with additional structures and capable of additional functions.
  • Animals are made up of eukaryotic cells, which have a nucleus and other organs enclosed by a membrane. Each organ handles a specific function for the whole cell.
  • Earth is the planet of the plants—and it all can be traced back to one green cell. The world's lush profusion of photosynthesizers—from towering redwoods to ubiquitous diatoms—owe their existence to a tiny alga eons ago that swallowed a cyanobacteria and turned it into an internal solar power plant.
  • Biochemistry Comparative anatomy Biogeography Comparative embryology Molecular biology Paleontology Modern examples Radioisotope dating These all support evolution
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