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How is nitrogen recycled through the environment (NITROGEN CYCLE)?

What is the importance of microorganisms in the nitrogen cycle?

How can environmental change be measured?

Approximately when did Earth begin?

What has happened in life of Earth, including species that are now extinct?

Where does variation take place, and what happens?

What is caused when mutations take place in genes?

What happens when mutated genes in sex cells are passed on?

What is natural selection?

What is selective breeding?