Different mutations occur in each sub-population. Natural selection occurs with different selection pressures changing each sub-population over many generations. If the isolating barrier is removed, the sub-populations can no longer interbreed to produce fertile offspring. This is because the sub-populations are now so genetically different after many generations of evolution. An isolation barrier can be geographical (oceans, mountains, deserts), reproductive, or ecological. Key Area Section Biodiversity Biotic and abiotic factors and the Biomes distribution Ecosystem of life Niche Key words: Species, population, producer, consumer, herbivore, Energy in carnivore, and omnivore Ecosystems Transfer of energy in food chain Pyramid of numbers, biomass, and energy Intraspecific and interspecific competition Nitrogen Cycle Growing population requires more food from Human farmers Impact on the Use of fertilisers and how Environment they can leach into rivers Pesticides + Bioaccumulation
Different mutations occur in each sub-population. Natural selection occurs with different selection pressures changing each sub-population over many generations. If the isolating barrier is removed, the sub-populations can no longer interbreed to produce fertile offspring. This is because the sub-populations are now so genetically different after many generations of evolution. An isolation barrier can be geographical (oceans, mountains, deserts), reproductive, or ecological. Key Area Section Biodiversity and the distribution of life Biotic and abiotic factors Biomes Ecosystem Niche Energy in Ecosystems Key words: Species, population, producer, consumer, herbivore, carnivore, and omnivore Transfer of energy in food chain Pyramid of numbers, biomass, and energy Intraspecific and interspecific competition Nitrogen Cycle Human Impact on the Environment Growing population requires more food from farmers Use of fertilisers and how they can leach into rivers Pesticides + Bioaccumulation
%5B1417%5DLife_on_Earth_summary_notes.docx