World population first reached 1 billion in the year ________
Fill in the blank(s) with correct word
1850
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Which of the following statements is true?
A. The valence electrons are always paired in the valence shell. B. The valence electrons are only from s and p orbitals in the valence shell. C. All of the electrons in the valence shell are valence electrons. D. Paired valence electrons are more unstable than unpaired valence electrons. E. Nonbonding electrons are not found in the valence shell.
Archean and Proterozoic greenstone belts are similar except Archean greenstone belts have
significantly more ultramafic lava. Indicate whether the statement is true or false.
Which of the following is associated with botulism poisoning?
A) improper functioning of the acetylcholine receptor B) improper release of the acetylcholine messenger C) improper synthesis of acetylcholine D) improper synthesis of the acetylcholine messenger
The Sun's radiant energy is composed primarily of visible light and infrared wavelengths
Indicate whether the statement is true or false