Organic compounds are used as building blocks for
1. water, DNA, and starches
2. water, proteins, and oxygen
3. proteins, DNA, and carbon dioxide
4. proteins, starches, and fats
Answer : Organic compounds are compounds that contain Carbon, C and contain Hydrogen, H as well. Let's look at our answer choices to try to eliminate some answers. Water, H2O does not contain carbon is therefore not organic.We can eliminate choices 1, 2 since they contain water. Carbon dioxide, CO2, contains carbon but doesn't contain hydrogen, and therefore we can eliminate choice 3 as well. This leaves us with choice 4, indeed, proteins, starches and fats are organic compounds.
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