Ques: Answer the following question given this paragraph: Seawater has lots of salts in it. This increases its density (mass per volume) over fresh water. Temperature and pressure also affect density. Q: Salt in seawater causes it to have greater what, which is also affected by temperature and pressure? Choices: - mass - volume - area - density A:
Ans: density

Ques: Answer the following question given this paragraph: A circuit must be closed for electric devices such as light bulbs to work. The arrows in the diagram show the direction in which electrons flow through the circuit. The current is considered to flow in the opposite direction. Q: A circuit must be what in order for electric devices such as light bulbs to work? Choices: - open - down - cyclical - closed A:
Ans: closed

Ques: Answer the following question given this paragraph: Muscles can only contract. They cannot actively extend, though they can move or relax back into the non-contracted neutral position. Therefore, to move bones in opposite directions, pairs of muscles must work in opposition. Each muscle in the pair works against the other to move bones at the joints of the body. The muscle that contracts to cause a joint to bend is called the flexor . The muscle that contracts to cause the joint to straighten is called the extensor . When one muscle is contracted, the other muscle from the pair is always elongated. Q: What is the name of the muscle that contracts to cause the joint to straighten? Choices: - flexor - abductor - opposing - extensor A:
Ans: extensor

Ques: Answer the following question given this paragraph: When bread bakes, yeast releases carbon dioxide gas, forming the small holes in bread. The gas was produced by alcoholic fermentation carried out by yeast. Q: When bread bakes, yeast releases which gas? Choices: - carbon monoxide - oxygen - hydrogen - carbon dioxide A:
Ans:
carbon dioxide