Cellulosic ethanol can be made from plant matter composed primarily of inedible cellulose fibers that form the stems and branches of most plants.

Rations were composed primarily of ship biscuit (the main staple, rationed at 2 lb per person per day).

This first squad was composed primarily of transfer athletes from small schools and junior colleges around the nation.

Nascent chylomicrons are composed primarily of triglycerides (85%) and contain some cholesterol and cholesteryl esters.

These forests are composed primarily of pines and firs, which begin to grow at these elevations.