Which shows the correct flow of energy in a typical food web? *
A. herbivore ---> carnivore ---> producer ---> sunlight

B. sunlight ---> producer ---> herbivore ---> carnivore

C. carnivore ---> producer ---> sunlight ---> herbivore

D. producer ---> sunlight ---> herbivore ---> carnivore

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

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.