Answer:
A.
Explanation:
Phototropism is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs.
The thoracic cage is formed by the 12 pairs of ribs with their costal cartilages and the sternum.
I believe the term is prophage.
