Changes in the DNA sequence of a gene in a cell that can be inherited by offspring are called ____.
A. adaptations
B. mutagens
C. mutations
D. variable traits
E. selected traits
Answer: C
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At 10°C, which is more concentrated—a saturated solution of sodium nitrate, NaNO3, or a saturated solution of sodium chloride? (See figure shown above )
A) At 20°C a saturated solution of sodium nitrate, NaNO3, is more concentrated than a saturated solution of sodium chloride, NaCl. B) At 10°C a saturated solution of sodium chloride, NaCl, is more concentrated than a saturated solution of sodium nitrate, NaNO3 C) At 10°C a saturated solution of sodium nitrate, NaNO3, is more concentrated than a saturated solution of sodium chloride, NaCl. D) At 25°C a saturated solution of sodium nitrate, NaNO3, is more concentrated than a saturated solution of sodium chloride, NaCl.
What mineral test is shown in this photograph? 
A. streak B. specific gravity C. magnetism D. scratch test E. effervescence
Ozone pollution would be most favored in
A. sunny climates during the winter when volatile organic compounds can react with NO. B. sunny climates in winter when coal is burned in order to generate electric power. C. sunny climates during the summer when volatile organic compounds can react with NO. D. sunny climates in summer when coal is burned in order to generate electric power.
What is the difference between lava and magma?
A. One is found on the surface; the other under. B. They are made up of different minerals. C. One is solid; one is liquid. D. They are different crystalline structures. E. One is oceanic crust; one is continental crust.