Pls help me with this work​

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

What best describes lactic acid fermentation?

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles