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Blood has traveled from the heart to the toes. which describes the next step of the circulation process?
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Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.
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Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain
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Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content
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Plants take in energy from to sugar molecules in their leaves....
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