The mass number of an atom is defined as

Isotopes of the same element are different from one another in that

Gravity is a theory because it is

The scientist(s) given credit for first using the term “cell” to describe the basic unit of life is (are)

In an experiment, the number of individuals assigned to each treatment is called the:

You can painlessly wade into a pool, but doing a belly flop off of the high diving board hurts because of ______.

An amino acid contains

If an atom has a valence shell that is full, then it

An atom’s tendency to attract electrons is referred to as:

Trees are able to transport water hundreds of feet up from the roots because of