Which phrase best defines erosion? a. layering bits of rocks and soil b. cementing layers of rock together to form stone c. breaking up rocks into smaller pieces d. moving bits of rock and soil from one place to another

The correct answer is option D that is, moving bits of rock and soil from one place to another.  

Erosion in earth science refers to the activity of surface procedures, like wind or water flow, which removes the rock, soil, or dissolved substance from one location to another location of the Earth's crust. This natural phenomenon is a result of the dynamic activity of erosive agents, like ice, water, snow, plants, wind, animals, and humans.  

ecotourism pay for conservation efforts.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.