Based on the following passage, why is the California Academy of Sciences’ roof so unusual compared to other green roofs? One of the most unusual green roofs in the United States is that of the California Academy of Sciences, which includes mound-like structures covered in plants punctuated by a polka-dot pattern of round skylights. The edge of the roof is ringed with solar panels, and plants themselves—all 1.7 million of them—are planted in biodegradable vegetation trays.

It was designed rather than allowed to grow organically.
It has mounds with skylights in them.
It uses an organic liner to hold the plants.
It has solar panels in addition to plants.