Which situation would most likely result in evolution?
a dog has three alleles for a certain fur color.
a small population loses a few individuals.
a single individual leaves a large population.
a predator prefers one phenotype to another.

The carbon dioxide is one of the green house gases and mainly responsible for the increase of the earth's temperature. The plants uses the carbon dioxide for the photosynthesis process.

The plants that are exposed to the normal carbon dioxide can be used as a control in this experiment. Then the scientists will notice that if the amount of carbon dioxide is increased, does it show any positive or negative effects in the experiment.