Cells can interact by releasing proteins or other molecules as chemical signals. How do cells receive these signals?

Cells typically receive signals in chemical form via various signaling molecules.

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.

wegner's theory did not explain how the continents could move

explanation: