Across
1
Unit of heredity
3
Ball of burning gas in space
4
Chemical element in table salt
5
Element found in all living things
8
Tissue that contracts for movement
11
Hottest planet in solar system
12
Unit of electric potential
Down
2
Molten rock beneath Earth surface
5
Basic unit of life
6
Absolute temperature scale unit
7
Precious yellow metallic element
9
Center of an atom or cell
10
Particle of light
13
Infectious microscopic agent