Name the specialist cells in the walls of the structure X which enable peristalsis to occur. describe how they cause the food to be moved during peristalsis

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.

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answerblank(1) unconditioned stimulusblank(2); unconditioned response