Which of the following would best improve the validity of the experiment? Eliminating tank 1, because the DO stayed the same Eliminating tank 1, because the DO stayed the same A Observing the results of adding organic waste to tanks containing salt water Observing the results of adding organic waste to tanks containing salt water B Repeating the experiment several times and comparing the results Repeating the experiment several times and comparing the results C Increasing the amounts of green algae in each of the tanks, with tank 5 having the greatest amount Increasing the amounts of green algae in each of the tanks, with tank 5 having the greatest amount D Adding different types of waste to each tank and then checking the results

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive