Bio 2B- part 3
- Created by: Shine.7
- Created on: 15-02-15 14:18
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- Bio 2B-
- Fossils: remainds of organisms from many years ago, found in rocks
- provide evidence that organisms lived ages ago.
- 3 formations of fossils
- replaced by minerals
- rock substance formed on the original hard part
- casts and impressions
- formed in a soft material
- preservation where no decay happens
- decay microbes dont survive when there's no oxygen n moisture-so organism is preserved
- replaced by minerals
- EVOLVED: changed and developed.
- Speciation: development of new species
- occurs when ppopulation of the SAME species becomes so different that they can no longer breed.
- Isolation: population of a species are seperated
- separation due to physical barriers-geographically isoltes them: floods/earthquakes
- Conditions on either side= DIFFERENT. so, DIFFERENT CHARACTERISTICS will become common due to NATURAL SELECTION
- Eventually, the populations will have changed so much that it WONT BE ABLE TO BREED with one another--become SEPERATE SPECIES
- population shows variation bc wide range of alleles -invididuals better adapted to envirno=better chance of survival-breed successfully -alleles passed on to next.
- Conditions on either side= DIFFERENT. so, DIFFERENT CHARACTERISTICS will become common due to NATURAL SELECTION
- separation due to physical barriers-geographically isoltes them: floods/earthquakes
- Extinction: organism die out
- reasons for extinction: 1) environment changes quickly and can't eveolve quickly enough 2)new predator kills them 3)new disease 4) can't compete with new species 5)catastrophic event 6) new species develops(speciation)
- how life came about
- many hypothesis BUT, LACK of valid+reliable EVIDENCE
- scientist believed that they were soft-bodied,and decay away completely..fossil record incomplete.
- fossils probably destroyed by geological activity
- scientist believed that they were soft-bodied,and decay away completely..fossil record incomplete.
- many hypothesis BUT, LACK of valid+reliable EVIDENCE
- Species:group of similar organisms that can repodruce to give a fertile offspring
- Fossils: remainds of organisms from many years ago, found in rocks
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