Across
1
Biological catalyst
3
Gas form of a liquid
6
Group of similar cells
7
Mass per unit volume
8
Unit of power
10
Element found in all living things
12
Unit of energy
13
Preserved remains of ancient life
Down
2
Fourth state of matter
4
Tissue that contracts for movement
5
Unit of force
9
Amplified beam of light
11
Positive particle in nucleus
14
Particle of light