Which of the following causes unstable air to keep lifting?
A) ascent into a layer of stable air
B) entrainment
C) inversions
D) ascent into a layer of unstable air
Answer: A
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A group of small, lizard-like reptiles among which are the earliest known reptiles:a
lobe-finned fish d. phytoplankton b. placoderms e. protorothyrids c. labyrinthodonts
What molecule(s) is/are produced when hydrogen is used as an energy source?
A) Water B) Sulfur oxides and nitrogen oxides C) Carbon dioxide and nitrogen oxides D) Carbon monoxide
Which of the following can cause enzyme activity to either increase or decrease?
A) increasing the substrate concentration B) changing the pH C) both a and b D) neither a nor b
Today, the largest employer in the Washington, D.C., area is the ________
Fill in the blank(s) with correct word