Deltas
erosion
sand dunes
(not sure about this one) key currents
A coral reef is a complex [ecosystem] of calcium carbonate shells that are home to microbes, algae, invertebrates, and fishes, and its high productivity helps provide great species richness.
Explanation: dababy dababy wit your mom lets g00000000000000000000000000000
B) It requires energy
D) It involves the help of carrier proteins.
B.
Key word: slide
Think of sliding down a WATER slide.