The ____________ ____________ is the uppermost layer of seawater lit by the sun, whereas the ____________
____________ is the permanently dark layer of seawater. Fill in the blank(s) with the appropriate word(s).
photic zone; aphotic zone
euphotic zone; aphotic zone
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If two protons and two neutrons are removed from the nucleus of an oxygen atom, a nucleus of which element remains?
A. carbon-12 B. nitrogen-12 C. carbon-14 D. neon-18
As of 2014, the world population is about ____.
A. 3.0 billion people B. 5.0 billion people C. 7.0 billion people D. 9.0 million people E. 10.0 billion people
A projectile launched at 20° above the horizontal lands downrange. Without air resistance, what other projection angle for the same speed would produce the same downrange distance?
A. 45° B. 60° C. 30° D. 70°
Electromagnetic radiation is generated from all of the following EXCEPT.
A. changes in the energy level of the electron. B. the joining together of protons and neutrons through fusion. C. molecules' electrons and bonds that vibrate. D. unconfined waves that radiate out in all directions.