Answer the following question given this paragraph: A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. Two basic types of combustion engines are external and internal combustion engines. Q: What are the two basic types of combustion engines? Choices: - gas and steam - spark and steam - diesel and internal combustion - external and internal combustion engines A:
external and internal combustion engines
(Question)
Answer the following question given this paragraph: In some ways, a collection of gas molecules represents the simplest form of matter. Because the individual molecules are so far apart, they have only fleeting interactions with one another. In contrast, molecules that have clustered together to form a liquid or solid are constantly exerting forces on each other. In fact, it is only because of these attractive forces that molecular solids and liquids exist at all. In this lesson, we will look at some of the ways in which molecules and ions attract one another to form solids and liquids. Q: In some ways, a collection of gas molecules represents the simplest form of what? Choices: - life - energy - protein - matter A:
(Answer)
matter
Ques: Answer the following question given this paragraph: 4. State how phagocytosis helps defend the body from pathogens. Q: What does phagocytosis defend the body from? Choices: - allergies - obesity - parasites - pathogens A:
Ans: pathogens
(Q).
Answer the following question given this paragraph: The girl pictured above became negatively charged because electrons flowed from the van de Graaff generator to her. Whenever electrons are transferred between objects, neutral matter becomes charged. This occurs even with individual atoms. Atoms are neutral in electric charge because they have the same number of negative electrons as positive protons. However, if atoms lose or gain electrons, they become charged particles called ions. You can see how this happens in the Figure below . When an atom loses electrons, it becomes a positively charged ion, or cation. When an atom gains electrons, it becomes a negative charged ion, or anion. Q: Gain or loss of what causes an atom to become a negatively or positively charged ion? Choices: - protons - neutrons - nucleus - electrons A:
(A).
electrons
Ques:Answer the following question given this paragraph: Halide minerals are salts. They form when salt water evaporates. This mineral class includes more than just table salt. Halide minerals may contain the elements fluorine, chlorine, bromine, or iodine. Some will combine with metal elements. Common table salt is a halide mineral that contains the elements chlorine and sodium. Fluorite is a type of halide that contains fluorine and calcium. Fluorite can be found in many colors. If you shine an ultraviolet light on fluorite, it will glow!. Q: What causes halide minerals to form? Choices: - salt water accumulation - fresh water ionization - salt water ionization - salt water evaporation A:

Ans:salt water evaporation
Ques:Answer the following question given this paragraph: Sometimes power is measured in a unit called the horsepower. For example, the power of car engines is usually expressed in horsepowers. One horsepower is the amount of work a horse can do in 1 minute. It equals 745 watts of power. Compare the horsepowers in the Figure below to the other Figure below . Q: How many watts equals a horse power? Choices: - 695 - 904 - 375 - 745 A:

Ans:
745