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What do you need to use in order to work as an environmental scientist?
You need to use the scientific method and
In order to work as an environmental scientist.

You need to use the scientific method and knowledge of the environment and earth systems in order to work as an environmental scientist.

Explanation:

An environmental scientist works based on the fact that it has the knowledge of the environment and he is aware of the interaction between the environment and other components associated with it.

An environmental scientist study about the effect of environment on plants and animals as well as earth systems to protect, understand and develop research methods.

the answer is c) an oak tree