Skin cream and lipsticks have approximately the same basic composition. What is added to lipsticks to make them more firm?
A) wax
B) cellulose
C) petroleum jelly
D) abrasive
Question 2
Which of the following did NOT contribute significantly to the conversion of plant material to coal?
A) There was sufficient oxygen for the cellulose in the plant materials to decay completely.
B) The plant material was buried under mud and water, separating it from the atmosphere.
C) The plant material was subjected to significant pressure.
D) The plant material broke down and small molecules containing a lot of hydrogen and oxygen were given off.
TB skin test.
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