Across
1
Basic unit of life
3
Biological catalyst
4
Nerve cell in the brain
7
Reddish electrical conductor
8
Disturbance that transfers energy
10
Magnetic metallic element
Down
2
Push or pull on an object
5
Amplified beam of light
6
Substance with pH above 7
9
Particle of light
11
Unit of energy
12
Form of thermal energy