Stella thinks that if people are exposed ultraviolet light then they are more likely get skin cancer. stella designs an experiment wherein sample a consisted of people were exposed to ultraviolet light and sample b was not.
what is the control group?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

The allele for curly hair is incompletely dominant. if a mother is homozygous for curly hair and the father is homozygous for straight hair, what percentage of the offspring will exhibit characteristics of both parents? 25 percent 50 percent 75 percent 100 percent