After all this info you have given me, the correct one is Keystone species. As defined in sources like National Geographic, <span> These are types of plants or animals that play a unique and crucial role in the way an ecosystem functions. Without </span>keystone species<span>, the ecosystem would be dramatically different or cease to exist altogether. I hope this helps you a lot </span>
Answer:
I would believe it's A Cell
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Coral reefs ecosystem : It is a type of ecosystem which is present inside the ocean water. It is made up of coral, sponges and crustaceans etc.
It is very important to conserve biodiversity of marine because more than twenty five percent of marine animals are live there. If these coral reefs are removed from marine ecosystem, many species of marine such as fishes, crustaceans will be adversely affected.
Answer: The water cycle is not a nutrient cycle
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