What two kinds of fog are the result of adding moisture to a layer of air?

1. Frontal fog

2. Steam fog

Explanation:

1.Frontal  fog

type of fog in which is formed when the rain drops from the area of warm air above a frontal surface move to the area of cooler air relatively close to the surface of earth and become saturated with it.

2. Steam fog

It occurs in the oceans where the cold air which is above the warm water  saturated with the warm air above it.  it will become shallow and the fog will form above the surface of ocean.

digestion

it excretes wastes