Read the article and use the information to answer the following questions.
carnegie stages
review the images and text about stages 13 (about 32 days) and 23 (about 53-58 days), and compare the limb development at these stages.

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