A gardener is planning a breeding program. Her aim is to increase the variety of colors and petal shapes of plants. Which method should she use when selecting the flowers to be planted?

Energy is destroyed internally, which drives the weathering of the rocks on the hill.
Energy from the rocks is transferred internally, which drives the weathering on the hill.
Energy from the sun drives the weathering of the rocks on the hill.
Energy is not a part of this process.