AQA Gcse Biology Additional Foundation Cards. 0.0 / 5 ? BiologyEvolution, extinction and natural selectionGCSEAQA Created by: faheembuttCreated on: 25-04-15 11:54 What are fossils? Fossils are the remains of organisms from many years ago, which are found in rocks. 1 of 7 State 3 ways that fossils can be formed. -From gradual replacement by minerals. -From casts and impressions -From preservation in places where no decay happens. 2 of 7 State 3 environmental factors which causes a species to become extinct. Any 3 from; predators / disease / lack of food / competition / loss of habitat / climate change / catastrophic event – or volcanic eruption / flood / drought / temperature change / weather change / ice age / change in atmosphere 3 of 7 Define speciation. Speciation is when a new species develops. 4 of 7 Define isolation. Isolation is where populations of a species are separated e.g. due to a physical barrier. 5 of 7 How can fossils give evidence for evolution? The fossils show change with time. 6 of 7 Why are scientists uncertain about how life began on Earth? There is insufficient / no evidence to prove how life began on Earth. 7 of 7
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