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Varieties of elements called ____ differ from one another only in number of neutrons and therefore in atomic mass.

The positively charged particles in the atom nucleus are called

Is H2 a(n) _________?

When you exercise you generate excess heat and your body temperature rises. Blood vessels dilate in the skin, warm blood flows closer to the body surface, and you lose heat. This is an example of

At the arrow, this structure belongs to what system?

Letter “C” is what serous membrane?

White blood cells engulf bacteria by means of ______.

What membrane is illustrated here?( Stuck on the heart)

______ are the most abundant molecules in the plasma membrane

What characteristic groups all lipids together?