BIOLOGY 1M03 Lecture Notes - Lecture 9: Cambrian Explosion, Coevolution, Gene Duplication

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Horizontal gene transfer: something swallowed something else- or an microorganism entered another organism in a symbiotic relationship. Stopped reproducing separately, and shared their unique types of organelles. Living in swampy areas or underground (habitat bias) Hard things or hard parts of things, bones, scales etc (taxonomic bias) Things that lived more recently have had less time to be destroyed or to be buried too deep for recovery (temporal bias) Things that are more abundant have more chances to be preserved (abundance bias) **just because there wasn"t a fossil doesn"t mean it wasn"t there. Just because you see a lot doesn"t mean there was a lot in nature. Ex: orchid pollen on bee fossil allowed scientists to know that there was a speci c type of orchid in that era, but also how long ago the bee was found. For most of earths 4. 5 million yr life there has been: life, but no multi cellular organisms.

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