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Life Cycle Evolution

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Western University
Biology 2483A
Hugh Henry

Life Cycle EvolutionDifferent stages and their advantagesKiwi birdextreme example of parental investmentsingle egg inside of the birdDispersal is the movement of organisms or propagules from their birthplaceEach bar shows the length of time that one species persisted in the fossil record On average species with nonplanktonic larvae persisted 22 million years whereas species with planktonic larvae persisted 44 millions yearsOften organisms as they go through developmentend up in different environment with different pressures Small organisms fit in mouths of other organismsin oceans a lotcan u hide Toxic If something can swallow you it will larger sizea lot less predation on youearly stages are more vulnerable then larger stagesWhy we see specialization in sizes Once the larvae have accuulated sufficient mass they metamorphose into adult butterflies moths and beetles whos main function is often to disperse find a mate and reproduceSmalldisperse easilyfloating in currentadvantage in exploring new environments Feeding machines when smallmaximizing growth rate Protectionsmall stages grow extreme spines or structures that save them Crabhuge spine on its backbigger disadvantagedeters fish from eating themcau
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