Based on the information typically provided in resources about the carbon cycle, here are the likely answers to your questions:
A) Which of the following is one of the main carbon pools on Earth?
- Oceans (This is a significant carbon pool, in addition to others like the atmosphere, land biomass, and fossil fuels.)
B) In which of these processes do plants absorb carbon?
- Photosynthesis (Plants take in carbon dioxide from the atmosphere and convert it into glucose during photosynthesis.)
C) Which of these organisms perform photosynthesis in the ocean?
- Plankton (Specifically, phytoplankton are the primary photosynthetic organisms in marine environments.)
D) What happens to the carbon within an aquatic organism when that organism dies and decays?
- It is transferred to the bottom of the ocean and is locked away in ocean sediments (Carbon from dead organisms can become part of sedimentary deposits, sequestering it over geological time scales.)
I hope this helps! Let me know if you need further clarification or assistance.