WARNING: This answer is NOT technical! ⚠
Plants can get their nutrients from the ground and dirt. But they grow using the carbon around them (Like the carbon dixiode we breathe out).
Most energy in food chains come from the sun. Plants absorb energy from the sun through photosynthesis. Animals who eat those plants are getting energy from that, and animals who eat those animals are getting energy from the sun as well.
I believe your pointing to number 16, I believe the answer is B
Light reaches organisms in the photic zone, where microscopic Phytoplankton and multicellular algae provide food for the animal community. Light levels in aphotic zone are too low to support photosynthesis. The seafloor is called the Benthic realm. Fishes and marine mammals swim in open water known as the Pelagic realm. A distinctive Biome called an Estuary is found where a freshwater stream or river merges with the ocean.
Photic zone is the surface layer of the ocean that receives sunlight, which means it permits photosynthesis by plants and phytoplankton. In aphotic zone , there is no light, therefore the phytoplankton and algae can not grow and undertake photosynthesis, the carbon dioxide is accumulated, there is less Oxygen and the pH is lower than in the photic zone.
Answer:
organisms living in a particular area
