Genetic engineering is used in the biotechnology industry to?
(1) eliminate all infections in livestock
(2) synthesize hormones such as insulin and human growth hormone
(3) increase the frequency of fertilization
(4) eliminate sexual reproduction

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.

c. is the correct answer