(b)
the average number of alveoli in each human lung is 280 million.
the average surface area of 1 million alveoli is 0.25 m2.
calculate the total surface area of a human lung.
answer

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

What in scientific term why the salty popcorn causes this thirst

Climate like that in the sahara desert have the fastest rates of weathering