"most moss gametophytes do not have a cuticle and are 12 cells thick. what does this imply about moss gametophytes and their structure? "

This implies that the gametophytes can easily lose water to, and absorb water from, the atmosphere. 
Moss is a flowerless, spore-producing pant. The main moss structure is the gametophyte, a moss's stem and leaves. A moss stem also the axis supports leaf-like structures that carry out photosynthesis, transforming sunlight into sugars the moss uses for food. 

The short-term effect of tar on the body is increased blood pressure.