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1. A hummingbird species feeds almost exclusively on the nectar of Heliconia flowers. Each hummer has a circuit that takes it from one plant to another, with the bird showing up regularly at a given flower after a set period. It could be 30 minutes more or less to do the […]

Q1. Mutations in the genes that encode certain mitochondrial proteins are associated with a high incidence of some types of cancer. How might defective mitochondria lead to cancer? Q2. Suppose archaeologists discover human skeletal remains in Ethiopia. Examination of the bones suggests that the remains represent four types of individuals. […]

A student hypothesized that anteaters had a smaller thermal neutral zone than bears. She measured oxygen consumption and body temperature of anteaters and bears at 10, 15, 20, 25, 30, 35 and 40oC. Sketch the graphs of VO2 and body temperature that support the hypothesis. Assume the following: their body temperature […]

Examine the two squirrel populations in the following figure. the populations are separated by a geographic barrier. if after a long period of the time the two species are no longer separated what evidence is needed to determine if speciation has occurred? Choices: 1. Hybrid offspring of the two population […]