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March 27, 2017

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

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

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

  • Science - ,

    yes, yes, yes.

  • Science - ,

    thanks

  • Science - ,

    Yah mommah'

  • Science - ,

    Small fragments of orbiting bodies that have fallen on Earth's surface are known as

  • Science - ,

    Please do not solicit answers on Y!A, as this is considered cheating.
    If you need help, please contact the school.

    Penn Foster

  • Science - ,

    Please do not solicit answers on Jishka, as this is considered cheating.
    If you need help, please contact the school.

    Penn Foster

  • Science - ,

    B. smog

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