If a chemical reaction such as photosynthesis begins with 6 atoms of carbon [C], how many atoms of carbon [C] should be in the products?
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OPTIONS:
- 12 atoms of carbon [C]
- 6 atoms of carbon [C]
- 3 atoms of carbon [C]
- 2 atoms of carbon [C]

6 atoms of carbon [C]

Heat from deep in Earth's interior is transferred to its crust by which of the following?
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OPTIONS:
- conduction in the ocean
- convection in the mantle
- radiation from the solid core
- evaporation at mid-ocean ridges

convection in the mantle

Competition is most likely to occur between which two organisms?
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OPTIONS:
- deer and butterflies
- owls and bacteria
- goldfish and rabbits
- grass and strawberry plants
grass and strawberry plants