Plants convert the sun's energy into carbohydrates via photosynthesis.
Answer: A mollusk accidentally imported from Europe. They clog pipes and water ways.
Explanation:
Complex molecules are made up of other elements bonded with carbon. Carbon is able to bond with other molecules so easily because it has four valence electrons.
I would think that an unweathered rock would be jagged while a weathered rock would be smooth because of water/wind or what ever weathered it.
