Ques:Answer the following question given this paragraph: Single pulleys may be fixed or moveable. Compound pulleys consist of two or more pulleys. Q: What is the minimum number of pulleys needed for a compound pulley? Choices: - 1 - 4 - zero - 2 A:

Ans:2
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Ques:Answer the following question given this paragraph: Brightly colored fruits attract animals that may disperse their seeds. It's hard to miss the bright red apples on these trees. Q: What is an advantage of brightly colored fruits? Choices: - make pretty paintings - dyes for clothing - warning of poisons - attract animals to disperse their seeds A:

Ans:attract animals to disperse their seeds
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Ques:Answer the following question given this paragraph: Some bacterial autotrophs make food using chemosynthesis. This process uses chemical energy instead of light energy to produce food. Q: What type of energy does chemosynthesis use to make food? Choices: - GRAVITATIONAL energy - CHEMICAL energy - carbon energy - chemical energy A:

Ans:chemical energy
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Ques:Answer the following question given this paragraph: In the study of chemical reactivity, we will find that the electrons in the outermost principal energy level are very important and so they are given a special name. Valence electrons are the electrons in the highest occupied principal energy level of an atom. In the second period elements listed above, the two electrons in the 1 s sublevel are called inner-shell electrons and are not involved directly in the element's reactivity or in the formation of compounds. Lithium has a single electron in the second principal energy level and so we say that lithium has one valence electron. Beryllium has two valence electrons. How many valence electrons does boron have? You must recognize that the second principal energy level consists of both the 2 s and the 2 p sublevels and so the answer is three. In fact, the number of valence electrons goes up by one for each step across a period until the last element is reached. Neon, with its configuration ending in s 2 p 6 , has eight valence electrons. Q: What is electrons in the highest occupied principal energy level of an atom called? Choices: - non-valence electrons - shell electrons - gradient electrons - valence electrons A:

Ans:
valence electrons
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