Land plants evolved long before any animals appeared on earth. when they came onto land, they needed ways to keep from losing water, to reach the sun, and to produce oxygen. they started to convert the atmosphere from carbon dioxide to oxygen. which of these is believed to be the common ancestor of land plants?

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.