Which of the following can result in irregularities leading to cancer?           a. the body using cyclins to regulate the timing of the cell cycle   b. the body utilizing growth factors in development   c. the body programming its cells to die   d. the body failing to respond to signals that slow the cell cycle

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.