Across
1
Nerve cell in the brain
5
Natural satellite of Earth
6
Unit of heredity
8
Curved glass that refracts light
10
Biological catalyst
11
Chemical element in table salt
Down
1
Unit of force
2
Substance with pH above 7
3
Center of an atom or cell
4
Force that attracts objects together
7
Compound containing oxygen
9
Group of similar cells