Science第 90 / 120 题
Which statement correctly describes an atom?
a.It is a living cell.
b.It is the smallest unit of an element.
c.It is a type of energy.
d.It is only found in plants.
解析
An atom is the smallest particle of an element that still retains that element's properties. Atoms combine to form molecules and compounds. They are the fundamental building blocks of all matter, living or not.
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