Across
1
Unit of heredity
3
Unit of force
4
Infectious microscopic agent
5
Center of an atom or cell
9
Measure of matter in an object
Down
1
Precious yellow metallic element
2
Nerve cell in the brain
4
Gas form of a liquid
6
Curved glass that refracts light
7
Ball of burning gas in space
8
Substance with pH above 7
10
Naturally occurring inorganic solid
11
Group of similar cells