Darwin's Theory

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B3: Life On Earth

  • Species are a group of organisms who can breed fertile offsprings
  • Adaptation is key to survival
  • When a species die out, it is called extinction
  • When a species is at risk of extinction, they are called endangered
  • New species can endanger others because of them being: competitive, predator, disease
  • Food web shows interdependence
  • Producers, consumers, decomposers, detritivores 
  • Energy is lost as you go up the chain because of: life process, heat energy, excreted, decomposers
  • Carbon cycle is altered by: respiration, photosynthesis, combustion and decomposition
  • Key words in a nitrogen cycle are: nitrogen fixation, nitrogen fixing bacteria, denitrifying bacteria and denitrification
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