Across
1
Tissue that contracts for movement
4
Precious yellow metallic element
5
Ball of burning gas in space
8
Biological catalyst
9
Path of a planet around the sun
10
Tectonic landmass section
Down
1
Naturally occurring inorganic solid
2
Curved glass that refracts light
3
Unit of heredity
6
Basic unit of life
7
Group of similar cells