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Genetic variation, as well as changes in the environment, cause characteristics of organisms to change over time. This process of natural selection leads to the evolution of new species.

Advances in biological techniques have had a huge impact on the way that scientists classify organisms on Earth. They have helped us to find out to what extent organisms are related to one another.

All organisms depend on other organisms and the environment to live. Human activities can result in ecosystems being damaged. Conserving biodiversity will make sure we have the resources we need.