14. the sun's layer is called the photosphere . a. true . b. false . 15. meteoroids can form when comets break apart , creating dust clouds. a. true . b. false . 16. a star is born whenever a nebula expands. a. true . b. false . 17. a star system has at least three stars. a. true . b . false

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.

Determine the maximum r-value of the polar equation r =3+3 cos 0

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is