What removes bacteria and dead cells?

What came first egg or chicken? and is tomato a vegetable or a fruit?

8) 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. d) a dog is getting hot in the sunlight, so he moves to a shaded area.

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?