The _____ was the time period when humans began to farm and raise animals.

Which of the following is NOT a major requirement for the survival of all living things?

The _____ was the time when humans started using machines to produce goods.

_____ is the fair treatment of all people concerning environmental problems.

A theory may eventually become a _____.

The variety of life on Earth is called _____.

Preserving natural resources for future generations is part of a(n) _____.

Items humans have made, such as homes and roads, are examples of the _____.

A(n) _____ is the environment where an organism lives.

The variety of life on Earth is called _____.

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