Which of the following research questions would be the most appropriate selection for a student studying space exploration? A. Is space travel the future of human kind?

B. Have we been visited by aliens?

C. What potential resources could be gained from the rise of asteroid mining?

D. Should we stop funding NASA?

D should we stop.funding NASA

digestion

it excretes wastes

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.