As of 2013, how many states require pharmacy technicians to be registered in order to practice?

There are many types of sensory receptors, starting from the very simple nerves that receive pain to very complex receptors, including those in the ______ of the eye, which collects all the input necessary for sight

a. retina b. iris c. pupil d. lashes

What size sieve is used to comminute powder in a Wedgwood or porcelain mortar and pestle?

A) 50 mesh B) 100 mesh C) 200 mesh D) 500 mesh