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kiruha [24]
3 years ago
8

As life began to populate earth’s surface, what change was seen in the atmosphere?

Biology
2 answers:
ki77a [65]3 years ago
8 0
Your answer is D

Biology is my best subject 
Andrei [34K]3 years ago
8 0

D. More oxygen was added.

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Explanation:

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A teacher thinks that students do better on tests when they get to write essays instead of multiple choice. He thinks this because the students can explain their reasoning. On multiple choice questions, students cannot do that and he cannot give students partial credit. The teacher gives one class multiple choice questions and the other essay questions. He compares the scores after each class. Identify the: INDEPENDENT VARIABLE, DEPENDENT VARIABLE, HYPOTHESIS, EXPERIMENTAL GROUP, and CONTROL GROUP.

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