How can you obtain a cell's ratio of surface area to volume?

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)