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Answer Key
Grade 7 Reading — Science
1.
burning coal, oil, and natural gas
2.
coral bleaches when temperatures stay high, weakening the partnership with algae
3.
trees burn and release stored carbon, which can intensify warming
4.
satellites, weather stations, ice cores, ocean buoys, or climate models (any two)
5.
planting shade trees, wind/solar energy, drought-resistant seeds, or reducing energy waste (any one)
6.
a twisted ladder / double helix
7.
proteins
8.
two copies—one from each parent
9.
identifying cancer mutations, forensic profiles, crop breeding, or CRISPR debates (any one)
10.
evolution conserved many shared genes that control basic functions
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