Which of the following statements describe a mixture?
A) A mixture does not contain a fixed ratio by mass of the component elements.
B) Chemical techniques are required to separate the components of a mixture.
C) both a and b
D) neither a nor b
A
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Compare and contrast land plant communities of the Triassic and Jurassic with those of the
Cretaceous. What will be an ideal response?
Briefly explain why water vapor may either contribute to or slow global warming
What will be an ideal response?
Ozone in the stratosphere
a. ?is a health hazard for people with respiratory illnesses. b. ?protects life from harmful ultraviolet radiation. c. ?is one of the main ingredients of photochemical smog. d. ?provides healthy levels of vitamin D to humans. e. ?is an aerosol found in the ionosphere.
The aphotic zone is the near-surface zone of the ocean where light is strong enough for photosynthesis to occur
Indicate whether the statement is true or false