What substance did the first bacteria on earth release into the atmosphere making other life forms possible?

a. water
b. sunlight
c. oxygen

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

What are some natural measures of time