In which era was there animal life found only in the ocean but plants were growing of land?
a. cenozoic era
b. mesozoic era
c. precambrian era
d. palezoic era

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