When the rocks are removed from a desert's ecosystem, the animals that depend on those rocks for homes would be in trouble. If these animals died due to predators and a lack of homes, then the other animals (predators) that depend on them for food would start to need other sources of food. This would cut into another predator's food supply and so on.
D. Observe how coral colonized a sunken ship. Ecologists look at how a whole ecology develops and maintains itself, so in this case, the coral on the sunken ship would be a whole ecology and the person studying it would be an ecologist.
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Those were my old notes hopefully it helps you!! goodluck.
I believe your answer should be glacial drift