Science Worksheet - Grade 8 Intermediate Level - The University Of The State Of New York - 2012 Page 21
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32Base your answers to questions 65 and 66 on the information and diagram below and on your knowledge
of science. The diagram represents the life cycle of a frog.
Frogs live most of their lives in and around water. During the tadpole stage, they live
entirely underwater and get oxygen through their gills. As adults, frogs can live on land and
breathe air.
Tadpole
Adult
(Not drawn to scale)
65 Identify one structural change to this organism’s body that occurs during its life cycle. [
]
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66 An environmental change causes a decrease in the amount of oxygen that is dissolved in the pond water.
Explain why this change would have a greater effect on the frog during the tadpole stage than during the
adult stage. [
]
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[21]
[OVER]
Grade 8 Science — June ’12
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