An engineer is building a new steel skyscraper in a area with a lot of Earthquakes, Compare two systems (fixed based system and base isolated system) and choose which one would be better.

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