Why do drive-reduction approaches fail to offer a complete account of human motivation? people are sometimes motivated to increase rather than decrease their level of stimulation. drive-reduction approaches are vague about what, or even how many, primary drives exist. drive-reduction approaches offer much better explanations of behaviors motivated by secondary drives than of behaviors motivated by primary drives. homeostasis does not accurately describe the mechanism by which primary drives operate.

4the indian leaf butterfly has traits that allow it to resemble a leaf. the bright colors of the monarch butterfly indicate that the butterfly tastes bad and can be poisonous. how does the appearance of these butterflies them to survive? f the indian leaf butterfly is able to avoid predators while the monarch butterfly warns predators away. g. the indian leaf butterfly frightens predators away while the monarch butterfly poisons predators before they can eat it. h both butterflies rely on camouflage to avoid predation. j both butterflies cooperate with one another to avoid predation.

Which image shows labeled organelles that are present only in plant cells?

What does natural resource management aim at ?