Across
1
Element found in all living things
3
Natural satellite of Earth
4
Infectious microscopic agent
7
Unit of heredity
8
Gas essential for breathing
9
Group of similar cells
10
Fourth state of matter
Down
2
Tissue that contracts for movement
3
Naturally occurring inorganic solid
5
Mass per unit volume
6
Substance with pH below 7
7
Precious yellow metallic element
11
Amplified beam of light