The Size of the Pupil Is Adjusted by a Doughnut-Shaped

question 495

Multiple Choice

The size of the pupil is adjusted by a doughnut-shaped ring of muscles called the

• A) fovea.
• B) cornea.
• C) iris.
• D) lens.

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Definitions:

Natural Selection

The process by which organisms better adapted to their environment tend to survive and produce more offspring, driving the evolution of species.

Mutations

Changes in the DNA sequence of a cell's genome, which can lead to variations in physical traits or affect the way an organism develops or functions.

DNA

Deoxyribonucleic acid, a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms.

Ultraviolet Radiation

A form of electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays, which can have effects on the skin such as tanning or burning.