Across
1
Group of similar cells
3
Center of an atom or cell
5
Icy body with a tail near the sun
6
Tissue that contracts for movement
8
Naturally occurring inorganic solid
Down
2
Substance with pH above 7
3
Nerve cell in the brain
4
Solid with repeating atomic pattern
7
Unit of heredity
9
Amplified beam of light
10
Positive particle in nucleus