Across
1
Group of similar cells
5
Compound containing oxygen
6
Precious yellow metallic element
7
Path of a planet around the sun
9
Amplified beam of light
Down
2
Solid with repeating atomic pattern
3
Infectious microscopic agent
4
Icy body with a tail near the sun
8
Tissue that contracts for movement
10
Mass per unit volume
11
Chemical element in table salt
12
Preserved remains of ancient life