Anew gene is discovered that dramatically aids in the digestion of fish. you hypothesize that populations with a history of being near the shoreline would have more copies of this gene than populations found farther inland. how would you classify this genetic difference

b. the carbon cycle ensures living things have a source of hydrogen

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.