Across
1
Element found in all living things
5
Compound containing oxygen
7
Unit of heredity
8
Natural satellite of Earth
11
Amplified beam of light
12
The Red Planet
13
Hottest planet in solar system
Down
2
Infectious microscopic agent
3
Unit of force
4
Tissue that contracts for movement
6
Positive particle in nucleus
9
Unit of energy
10
Center of an atom or cell