What scientist is credited with proposing the principle of uniformitarianism?
o james hutton
o nicolaus steno
o john wesley powell
o william smith

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