The right answer is C.invention
Contact lenses are placed directly on the surface of the eye to correct your eyesight.
They can correct myopia and hyperopia. They can also correct age-related astigmatism and hyperopia (presbyopia).
Their principle is the same as for glasses: they bend the light and redirect it to your retina to improve your eyesight.
Dioxy-ribo nucleic acid/dna
A person who specializes in the study of animals is called a zoologist. Zoologists who study certain kinds of animals have their own names.
