What is the difference between an electrically neutral atom and an ion?
a. An ion has an unequal number of protons and electrons, while a neutral atom has an equal number.
b. An ion has an equal number of protons and electrons, while an atom has an unequal number.
c. An atom has an unequal number of neutrons and protons, while an ion has an equal number.
d. An atom has its electrons in orbitals, while an ion has its electrons in its nucleus.
e. An atom must have an equal number of neutrons and electrons, while an ion does not.
a
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While walking a cornfield, you notice roots emerging from the corn stalks themselves, and you suspect that these roots are helping to hold the plants upright. These roots belong to a category of roots known as
A) Taproots B) Fibrous roots C) Adventitious roots D) Root hairs E) Special roots
In adult vertebrates, which of these is not one of the four principal kinds of primary tissues?
A. epithelial B. connective C. supportive D. muscle E. nerve
U.S. passenger pigeon populations are
a. healthy. b. threatened. c. endangered. d. extinct.
All genes are expressed in either the prenatal or newborn stages. Indicate whether the statement is true or false