Most of the infrared radiation to the Earth is absorbed and transmitted towards the Earth's surface.
A biotic factor is all of the students in the classroom.
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D is correct. Cool air sinks, which forces warm air to rise.
Convection is when warm material rises and cool material sinks
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Sugar is a component of carbohydrates, but it should be noted that this is a slightly misleading question, since sugar itself is actually a carbohydrate.
