Scientists have genetically engineered crops such as corn, cotton, and soybeans. which of the following statements about genetically modified crops is true? crop yield has decreased. crop yield has increased. crop yield has stayed the same.

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