Evolution and Biological Diversity

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Presentation transcript:

Evolution and Biological Diversity

Natural Selection Changes to environments may stress organisms. The organisms best adapted to the new environment will survive and reproduce in greater numbers.

Changes to environments can be natural or human-caused climate changes shifts in landmasses due to plate tectonics Farming logging hunting

Natural Selection

Natural Selection Produces organisms best suited to their natural environments.

Peppered Moths

Biodiversity •Species with the greatest variation in their genetic material will have the greatest potential for adaptation.

Selective Breeding (artificial selection) Has had a dramatic effect on the appearance and usefulness of farm animals. Cows, pigs and chickens produce more meat per animal than ever before.

Evidence Fossils (dating) The preserved remains or traces of organisms that lived long ago Evidence of evolution! Fossil record- the record of life that unfolded over four billion years

Evidence DNA Similarities

Evidence Homologous Structures- derived from a common ancestor

Evidence Vestigial Structures- structure in an organism that has lost all or most of its original function