List two ways in which the atmosphere would be impacted in the absence of the biosphere?

Biosphere comprises all the life that exists on earth including animals, plants, water bodies, microorganisms, algae, fungi etc.

If there would be no biosphere on earth the atmosphere would be quite different. There would be no oxygen to support because oxygen is liberated by plants in photosynthesis so no plants means no oxygen. The earth would be a planet without life just like Venus and Mars. Therefore, no organism would be surviving in the world.

There would be no  negligible green house effect and global warming since it is all created due to activities of men.The earth's atmosphere would be much cleaner and with lesser amount of CO2 and O2 but no organism would be there to use them.

Hope it help!

the eggs of the insects should be the first thing collected at the scene.

false