Answer:The Ozone Hole. One billion years ago, early aquatic organisms called blue-green algae began using energy from the Sun to split molecules of H2O and CO2 and recombine them into organic compounds and molecular oxygen (O2). ... As oxygen in the atmosphere increased, CO2 decreased.
The answer is D. All of the offspring would have one recessive allele, one dominant and purple flowers.
A dependent variable is something that relies on another variable; it is what is being measured in an experiment.
