The columns of the periodic table divide atoms by their ________
A) number of protons B) number of neutrons
C) number of valence electrons D) atomic mass
C
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Atmospheric nitrogen can be used directly by multicellular plants and animals.
Answer the following statement true (T) or false (F)
Because tectonic plates move in response to mantle convection, each plate moves at the same rate
a. True b. False
Scientists investigating a drug to cure a disease in birds conduct experiments. In these experiments, what would be the control group?
A) Birds that receive the drug being tested B) Birds that receive another drug not being tested C) Rats that receive the drug being tested D) Birds that do not receive the drug being tested
Diplomatic ties between the United States and Cuba were restored in 2015
a. True b. False Indicate whether the statement is true or false