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biomes -
key terms
Question | Answer |
---|---|
two reasons extinction occurs | destruction of habitat and introduction of new species |
evolution | change in species over time |
extinction | when the last individual of species dies |
natural selection | organisms that are better adapted to an environment survive and reproduce at a greater rate than organisms that are not |
mutation | process in which DNA changes result in new alleles |
adaptative radiation | production of several species from one ancestoral species |
nonliving environmental factors | temperature, rainfall, pollution, fire, flooding, elevation, volcano eruption |
living environmental factors | predators, available food, population of species |
Darwin's hypothesis of why there are so many living things of Earth | different, long term environmental influences on populations produced the variety of species |