1 A scientist tested a hypothesis that white-tailed deer would prefer apples over corn as a primary food source. The findings of the test, in which the scientist claimed that the deer preferred apples, were published. Which research technique, if used by the scientist, might result in this claim being questioned?

(1) The scientist observed four deer in different locations at various times of the day.
(2) The scientist observed a total of 500 deer in 20 different locations at various times of the day.
(3) The scientist observed 200 deer in various natural settings, but none in captivity.
(4) The scientist observed 300 deer in various locations in captivity, but none in natural settings.

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2 Which statement concerning tanning is correct?

(1) Tanning causes a decrease in the ability of the skin to regulate body temperature.
(2) Radiation from the Sun is the only radiation that causes tanning.
(3) The production of melanin, which causes tanning, increases when skin cells are exposed to the Sun.
(4) Melanocytes decrease their activity as exposure to the Sun increases, causing a protective coloration on the skin.

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3 Which statement concerning ultraviolet radiation is not correct?

(1) It may damage the skin.
(2) It stimulates the skin to produce antibodies.
(3) It is absorbed by the skin.
(4) It may stimulate the skin to produce excess pigment.

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4 Tomato plants in a garden are not growing well. The gardener hypothesizes that the soil is too acidic. To test this hypothesis accurately, the gardener could

(1) plant seeds of a different kind of plant
(2) move the tomato plants to an area with less sunlight
(3) change the pH of the soil
(4) reduce the amount of water available to the plant

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5. The current knowledge concerning cells is the result of the investigations and observations of many scientists. The work of these scientists forms a well-accepted body of knowledge about cells. This body of knowledge is an example of a

(1) hypothesis
(2) controlled experiment
(3) theory
(4) research plan

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