What are the two main branches of physical science? 1.chemistry and Earth science

2.physics and mathematics

3.chemistry and mathematics

4.physics and chemistry

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?

Explain what role the narrator believes he is playing in telling the story. describe how this belief will affect the story. your answer should be at least 250 words.