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Biology

For the first time in five years, California authorities have issued a stage one smog alert, warning of unhealthy ozone levels in the air in some areas. Smog comprises dangerous chemical compounds including sulfur dioxide, nitrogen dioxide, and carbon monoxide. Since wearing gas masks as depicted in the picture is impractical, a sensible plan would be to...

How many neutrons would be found in an isotope such as fluorine-21?

When Would I Use a Nipple Shield?

Because of the importance of pollination by bees of orchard crops, beekeepers ____________________ their bees to orchardists when their trees are in bloom.

Which of these would improve the water quality in a watershed? A. reduction in pesticide use B. use of more fertilizer C. destruction of wetlands D. erosion of more topsoil

Which one of the following most closely approximates the number of replicons in a human focus of replication?a. 1b. 50c. 100d. 300e. 30 000

Which is the most effective way to increase the oxygen content of air?. A.increase current global forest cover by 10 percent. B.reduce the growth of carbon emissions from the current 1.9 percent to 1 percent. C.increase research on eco-friendly fules

Which mutation would be most beneficial to an elephant and its descendents? A.a mutation of the hemoglobin allowing better oxygen-carrying capacity B.a mutation of the tail fur so it becomes course and thick C.a mutation of the skin color resulting in an albino (white) elephant D.a mutation of the tusk size and length resulting in smaller and shorter tusks

Which of the following does not accurately describe movement within plants? A. Changes in the concentration of nutrients affect the cause of movement of fluid through phloem. B. Movement of sugars within the xylem results from changes in concentration of water. C. Transpiration is the only force that drives water movement within a plant. D. Cohesion and adhesion contribute to capillary action, which contributes to water movement.

Which of the following structures is responsible for regulating body temperature? a. Hypothalamus b. Medulla oblongata c. Cerebrum d. Cerebellum

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