Cystic fibrosis is a recessive genetic disease caused by a mutation in the gene that encodes the CFTR protein, which transports chloride ions in and out of cells. Some populations have a relatively high rate of cystic fibrosis carriers, possibly because the mutation protects against severe dehydration in diseases like cholera or typhoid. What concept does this best illustrate? A: Polygenic traits
B: Genetic drift
C: Pleiotrophy
D: Heterozygote advantage

its letter b the genetic drift because it is mechanism of evolution in which allele frequencies of a population change over generation due to chance.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

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.