Question

what is one of the characteristics of the troposphere? low air pressure presence of the ozone layer high density of air molecules

Explanation:

The troposphere is the lowest layer of the Earth's atmosphere. It has a high - density of air molecules because most of the atmosphere's mass is in this layer. Air pressure is highest near the surface in the troposphere, not low. The ozone layer is mainly in the stratosphere, not the troposphere.

Answer:

high density of air molecules