T
he diagram shows the general structure of a lipid, which consists of two main parts.

Which part is circled?
alcohol group
fatty acid
carboxyl group
unsaturated lipid

enzyme speed up the reactions

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.