Instead of swimming alone, many types of fish swim together in groups, or schools. when grouped together, the fish may appear to be one large organism rather than many small organisms. this appearance to protect the fish from possible predators.

this relationship between fish is an example of

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