ecosystem

1. Microorganisms (1674)
Microscope lens grinder Anton Van Leeuwenhoek accidentally discovers microorganisms in a drop of water. Using his own microscopes, he observes sperm, bacteria and red blood cells. His observations lay the foundation for the sciences of bacteriology and microbiology.
2. The Cell Nucleus (1831)
While studying an orchid, botanist Robert Brown identifies a structure within the cells that he terms the "nucleus."
3. Archaea (1977)

74,000 years ago a supervolcano blew up in South-East Asia, threatening the humans and every animal, causing one of the major disasters after the extinction of the dinosaurs. (www.youtube.com)

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