During the fall the chlorophyll in the leaves of many plants starts to break down. the colors of other pigments present in the leaf revealed. how do you think a chromatography of a leaf that just turns red in the fall would compare with your chromatogram of a leaf that is red all year?

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.

Which characteristic should describe all evidence collected by a scientist? true obvious objective subjective

When fossil fuels are burned, carbon dioxide is released. how does this gas impact the environment?