What technological advance in the industrial revolution sparked a population explosion?

a. medical and public health practices spread to less-developed countries.

b. antibiotics were introduced.

c. agriculture was introduced.

d. agriculture became mechanized.

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