Answer the following question given this paragraph: Oxidation often involves the loss of hydrogen, the gain of oxygen, or the loss of electrons. Q: What often involves the loss of hydrogen, the gain of oxygen, or the loss of electrons? Choices: - decomposition - precipitation - carbonation - oxidation A:
oxidation
(Question)
Answer the following question given this paragraph: Pollution that enters water at just one point is called point source pollution . For example, chemicals from a factory might empty into a stream through a pipe or set of pipes (see Figure below ). Pollution that enters in many places is called non-point source pollution . This means that the pollution is from multiple sources. With non-point source pollution, runoff may carry the pollution into a body of water. Which type of pollution do you think is harder to control?. Q: What is pollution that enters water at just one point called? Choices: - entry point pollution - point supply pollution - point supply pollution - point source pollution A:
(Answer)
point source pollution
Ques: 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:
Ans: methane
(Q).
Answer the following question given this paragraph: Only mammals have hair. Hair is a fiber made mainly of the tough protein keratin. The cells of each hair are filled with keratin and no longer alive. The dead cells overlap each other, almost like shingles on a roof. They work like shingles as well, by helping shed water from hair. Q: What is the only class of animals that has hair? Choices: - reptiles - amphibians - birds - mammals A:
(A).
mammals
Ques:Answer the following question given this paragraph: Duplicated chromosomes are composed of two sister chromatids. Chromosomes are compacted using a variety of mechanisms during certain stages of the cell cycle. Several classes of protein are involved in the organization and packing of the chromosomal DNA into a highly condensed structure. The condensing complex compacts chromosomes, and the resulting condensed structure is necessary for chromosomal segregation during mitosis. Q: Duplicated chromosomes are composed of two sister what? Choices: - karyotypes - eukaryotes - nucleotides - chromatids A:

Ans:chromatids
Ques: Answer the following question given this paragraph: A single-replacement reaction is one in which an element replaces another element in a compound. An element is in either the solid, liquid, or gas state and is not an ion. The example below shows the reaction of solid magnesium metal with aqueous silver nitrate to form aqueous magnesium nitrate and silver metal. Q: In this type of reaction, an element replaces another element in a compound, and the element is in any state of matter but is not an ion? Choices: - double-replacement reaction - replication reaction - polar reaction - single-replacement reaction A:
Ans:
single-replacement reaction