Which key concept includes the main layers of the atmosphere?

98 points! include an answer and in advance!

The medium that carries message signals from senders to receivers of communication is

The use of fertilizer on a large farm would have the largest effect on which of the following? rate of photosynthesis in local plants amount of smog in the lower atmosphere rate of anaerobic respiration in aquatic bacteria extent of eutrophication in nearby water bodies rate of evapotranspiration from surrounding area