Which statement is characteristic of a concave lens?

it reflects most light.

it is thickest in the middle.

it bends light rays outward.

it is made of opaque material.

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

=force × distance a. work b. velocity c. pressure d. momentum