Match these items. 1. protective sacs aorta
2. carries blood to the body heart chambers
3. carries blood to the lungs valves
4. open and close pericardium
5. atria and ventricles pulmonary

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

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

Which transition by an electron will release the greatest amount of energy? oa ob oc od