Across
1
Element found in all living things
3
Group of similar cells
7
Unit of heredity
8
Compound containing oxygen
9
Naturally occurring inorganic solid
Down
1
Icy body with a tail near the sun
2
Positive particle in nucleus
4
Unit of electric potential
5
Curved glass that refracts light
6
Chemical element in table salt
7
Force that attracts objects together