February 24, 2017

Homework Help: Science

Posted by Beatrice on Wednesday, January 29, 2014 at 7:23pm.

1. The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates
A. drinking water.
B. smog.
C. pesticides.
D. acid rain.

2. Another name for unicellular organisms that dominated Earth up to the Precambrian time is
A. eukaryotes.
B. cyanobacteria.
C. prokaryotes.
D. stromatolites.

3. A substance that enters Earth's cycles and does harm to living things is
A. a pollutant.
B. freshwater.
C. oxygen.
D. hydrogen.

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