2011年12月12日星期一

Importance Of Survival

  1. Living things depend on each other for survival.
  2. If some species of living things cannot survive and become extinct, this will affect other living things that depend on them.
  3. For example, if the deer in a forest cannot survive, there will be a shortage of food for tigers that live in the same habitat.
  4. If the deer become exticvt, the tigers will also become extinct because of a shortage of food.

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