I took a quiz on this and i personally think it is A but check other resources hope this helped!
1) to repair and maintenance
2) they’re a main source of energy
3)they’re involved in the creation of some hormones
4)enzymes
5)transport and store molecules
6)antibodies
Explanation:
Cast and drop shadows are another common way to add depth. Reflections work similarly in that a reflection appears on a different surface. The illusion of depth can be increased by making the shadow larger and lighter and further away from the object. Blurring the edges of shadows also increases the illusion of depth.
The author is nervous about snorkeling