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Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2

Evolution acts upon the population of organisms and not on each individual organism

Your sense of touch depends upon: a. direct contact b. heat chemical c. reactions d. pain