Which best explains why a thick tropical forest filled with large plants typically has a lot of water vapor in the air?

Plants release water vapor into the air through transpiration, mainly from tiny openings in their leaves. A thick forest has many large plants, so their combined transpiration adds a lot of water vapor to the air. Condensation turns water vapor into liquid droplets; it does not explain how vapor gets into the air.

AI-written and checked against the verified answer.