When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus. The distance between the principal focus and the centre of the lens is called the focal length.
Answer:
An arctic fox changes its fur color to blend in with its surroundings
Explanation:
This is a defense mechanism because when it blends into its surroundings it can hide from its predators and help defend itself
Atom, cell, tissue, organ
Answer: there are islands
Explanation:
