Question

answer the following multiple - choice questions by dragging and dropping the highlighter over the correct response. 1. which of the following is considered the \backbone\ of organic molecules? a. nitrogen b. oxygen c. carbon d. phosphorus 2. which of the following makes it way to oceans through rivers? a. nitrogen b. oxygen c. carbon d. phosphorus 3. in the carbon cycle, where does carbon dioxide (co2) primarily originate before it enters the ocean? a. rivers b. plants c. detritus d. atmosphere 4. what process significantly contributes to the regulation of carbon dioxide (co2) in the ocean during the carbon cycle? a. respiration b. decomposition c. photosynthesis d. weathering of rocks 5. what is one of the primary forms of nitrogen that marine organisms take in during primary production in the nitrogen cycle? a. co2 b. nitrate c. phosphate d. sulfur dioxide 6. true or false: phytoplankton utilize carbon, nitrogen and phosphorus for life. a. true b. false

Explanation:

1. Carbon forms the backbone of organic molecules due to its ability to form stable covalent bonds with other carbon atoms and a variety of other elements.
2. Phosphorus is transported to oceans through rivers as it is weathered from rocks on land and carried by water runoff.
3. Carbon dioxide primarily originates from the atmosphere before entering the ocean as part of the carbon - cycle.
4. Photosynthesis by marine plants and phytoplankton takes up carbon dioxide in the ocean, regulating its levels.
5. Nitrate is one of the main forms of nitrogen that marine organisms take in during primary production in the nitrogen cycle.
6. Phytoplankton require carbon, nitrogen, and phosphorus for growth, reproduction, and other life - processes.

Answer:

1. C. Carbon
2. D. Phosphorus
3. D. Atmosphere
4. C. Photosynthesis
5. B. Nitrate
6. A. True