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When species are kept separate by preventing the formation of hybrid zygotes, the mechanism that keeps the species separate is known as a _____________ isolating mechanism.

Select the following phylum that includes coelomate, bilateral animals that have a structure called a notochord.

The early Earth’s reducing atmosphere probably contained all of the following except

Refer to the diagram below of the mammalian circulatory system. If blood is going from the lungs to space 3, what is the name of space 3?

How would a massive drop in atmospheric carbon dioxide affect the global climate?

Biomagnification is a significant problem in aquatic communities. The amounts of chemicals magnify (increase or accumulate) at each new link in a food chain. Use the following information to calculate the level of chemical X in the large-mouth bass. One small plant can accumulate 1 unit of chemical X. A microscopic animal eats 15 small plants. A minnow consumes 10 microscopic animals, a large-mouth bass consumes 20 minnows.

In human infants, there has long been evolution toward having the highest survival rate at a 6-7 pound birth weight. This is an example of

When only a very few individuals give rise to a new population in a new area of favorable habitat, the new population might possess different genotype frequencies for a certain trait than the larger population from which it separated. This effect is called the

When assessing an older adult client, the nurse notes which age-related changes of the cardiovascular system that increases the risk for falls?

A nurse is caring for a client with several medications. Part of the normal aging process is a decline in renal function. This is indicative of which phenomenon related to this change?