Water dissolves limestone creating underground caves.
a. erosion
b. weathering (my answer)

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

Which of these is a provisioning service people get from the ocean

Sharks depend on production for survival