Answer the following question given this paragraph: Today in many countries, death rates have gone down but birth rates remain high. This means that the population is growing. Figure below shows the growth rates of human populations all over the world. Q: Which veins return oxygen-rich blood from the lungs to the heart? Choices: - jugular - varicose - respiratory - pulmonary A:
pulmonary
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Answer the following question given this paragraph: An air mass is a large body of air that has about the same conditions throughout. For example, an air mass might have cold dry air. Another air mass might have warm moist air. The conditions in an air mass depend on where the air mass formed. Q: What is the term used for a large body of air of the same temperature and moisture conditions? Choices: - air group - sky mass - air pool - air mass A:
air mass
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Answer the following question given this paragraph: Q: If environmental conditions deteriorate, many species can form protective what? Choices: - fibers - proteins - shells - cysts A:
cysts
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Answer the following question given this paragraph: The sketch below shows how we see an image in a plane mirror. Plane mirrors work because the light rays create a virtual image behind the mirror. Light rays from the object strike the mirror and reflect according to the law of reflection. When some of the light rays enter our eye, our eye and brain interpret these rays as having traveled in a straight line path. Therefore, our eye and brain track the light rays backward to a position from which they appear to have come. At this position, we see an image. Q: Plane mirrors work because the light rays create what behind the mirror? Choices: - a mirror image - a entire image - a virtual example - a virtual image A:
a virtual image
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