Q: Answer the following question given this paragraph: A combination reaction is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions. The general form of a combination reaction is:. Q: What kind of reaction is a reaction in which two or more substances combine to form a single new substance? Choices: - power reaction - compounding reaction - chemical reaction - combination reaction A:
A: combination reaction

Q: Answer the following question given this paragraph: Passive immunity results when antibodies are transferred to a person who has never been exposed to the pathogen. Passive immunity lasts only as long as the antibodies survive in body fluids. This is usually between a few days and a few months. Passive immunity may be acquired by a fetus through its mother's blood. It may also be acquired by an infant though the mother's breast milk. Older children and adults can acquire passive immunity through the injection of antibodies. Q: What happens when antibodies are transferred to a person who has never been exposed to the pathogen? Choices: - acquired immunity - active disease - allergic reaction - passive immunity A:
A: passive immunity

Q: Answer the following question given this paragraph: Many archaeans live in close relationships with other organisms. For example, large numbers live inside animals, including humans. Unlike many bacteria, archaeans don't harm their hosts. None of them is known to cause human disease. Archaeans are more likely to help their hosts. For example, archaeans called methanogens live inside the gut of cows (see Figure below ). They help cows digest tough plant fibers made of cellulose. They produce methane gas as a waste product. Q: Archaeans produce what kind of gas as a waste product? Choices: - sulfide - carbon monoxide - carbon dioxide - methane A:
A: methane

Q: Answer the following question given this paragraph: Birth Prior to birth, the lungs are filled with amniotic fluid, mucus, and surfactant. As the fetus is squeezed through the birth canal, the fetal thoracic cavity is compressed, expelling much of this fluid. Some fluid remains, however, but is rapidly absorbed by the body shortly after birth. The first inhalation occurs within 10 seconds after birth and not only serves as the first inspiration, but also acts to inflate the lungs. Pulmonary surfactant is critical for inflation to occur, as it reduces the surface tension of the alveoli. Preterm birth around 26 weeks frequently results in severe respiratory distress, although with current medical advancements, some babies may survive. Prior to 26 weeks, sufficient pulmonary surfactant is not produced, and the surfaces for gas exchange have not formed adequately; therefore, survival is low. Q: Prior to birth, the lungs are filled with amniotic fluid, mucus, and what else? Choices: - blood - plasma - air - surfactant A:
A: surfactant