Can topical elastin become part of the native elastin

How do refracting telescopes magnify a far away image? a. by directing light beams to meet at a focal point b. by absorbing light beams’ wavelengths c. by forcing light beams to change direction d. by measuring light beams’ velocity

The use of a beat or a rhythm to remember something is

What is the meaning of the prefix un-? a. over b. above c. under d. not