11. Look at the figure above. Which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (Hint: It's where the clouds seen on Earth are formed.)
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O A. Stratosphere
OB. Exosphere
C. Troposphere
D. Thermosphere

Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. what could he have done to increase the validity of his data? reduce the number of plants. remove the 1 hour group. add a 0 hours control. measure the oxygen in liters

Which of the following would be an important part of a multi-step plan to restore the stability of the red-cockaded woodpecker's ecosystem?

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade