Which layer of the atmosphere has the highest layer of gas molecules

Troposphere

Explanation:

The mixture of gas molecules is no longer consistent and molecules with higher mass sink to lower layers. Therefore the Troposphere is the lower layer so it contains the highest gas molecules.

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.