One of Einstein's major contributions to the study of physics was his theory of .

Einstein's theories argued that the knowledge acquired through
was not always accurate.

In introducing his theories involving
, Freud tried to explain human behavior and emotion.

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