Aside from the lignocellulose, wood consists of a variety of low molecular weight organic compounds, called extractives. The wood extractives are fatty acids, resin acids, waxes and terpenes. For example, rosin is exuded by conifers as protection from <answer>insects</answer>. The extraction of these organic materials from wood provides tall oil, turpentine, and rosin.
What do conifers use rosin to protect themselves from?
insects