Identify evolutionary mechanisms that might account for the origin and persistence of cell-to-cell signaling systems in prokaryotes

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.

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.