Lions and tigers do not overlap in range and do not breed in nature. In captivity, they may mate and produce offspring, but those offspring are not fertile. Where would lions and tigers fall along the speciation arrow? Support your answer with evidence.

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.