Across
1
Element found in all living things
4
Absolute temperature scale unit
6
Positive particle in nucleus
7
Unit of energy
8
Infectious microscopic agent
9
Group of similar cells
10
Chemical element in table salt
13
Push or pull on an object
Down
2
Nerve cell in the brain
3
Preserved remains of ancient life
5
Compound containing oxygen
6
Glass that splits light into spectrum
11
Form of thermal energy
12
Center of an atom or cell