(Q).
Answer the following question given this paragraph: Nuclear fission is the splitting of the nucleus of a radioactive atom into two smaller nuclei. This type of reaction releases a great deal of energy from a very small amount of matter. Fission of a tiny pellet of radioactive uranium-235, like the one pictured in the Figure below , releases as much energy as burning 1,000 kilograms of coal!. Q: Splitting of the nucleus of a radioactive atom into two smaller nuclei yields what type of reaction, which releases a great deal of energy from a small amount of matter? Choices: - solar fission - nucleation - nuclear fusion - nuclear fission A:
(A).
nuclear fission

(Q).
Answer the following question given this paragraph: The Esophageal Phase The entry of food into the esophagus marks the beginning of the esophageal phase of deglutition and the initiation of peristalsis. As in the previous phase, the complex neuromuscular actions are controlled by the medulla oblongata. Peristalsis propels the bolus through the esophagus and toward the stomach. The circular muscle layer of the muscularis contracts, pinching the esophageal wall and forcing the bolus forward. At the same time, the longitudinal muscle layer of the muscularis also contracts, shortening this area and pushing out its walls to receive the bolus. In this way, a series of contractions keeps moving food toward the stomach. When the bolus nears the stomach, distention of the esophagus initiates a short reflex relaxation of the lower esophageal sphincter that allows the bolus to pass into the stomach. During the esophageal phase, esophageal glands secrete mucus that lubricates the bolus and minimizes friction. Q: The entry of food into the esophagus marks the beginning of the esophageal phase of deglutition and the initiation of this? Choices: - relaxation - digestion - propagation - peristalsis A:
(A).
peristalsis

(Q).
Answer the following question given this paragraph: Microbes use chemicals to make food. The chemicals pour out of a crack on the ocean floor at a mid-ocean ridge. What consumers live in this ecosystem?. Q: What do microbes use to make food? Choices: - nitrogen - sunlight - plants - chemicals A:
(A).
chemicals