Across
1
Unit of heredity
4
Preserved remains of ancient life
5
Basic unit of life
6
Amplified beam of light
8
Glass that splits light into spectrum
9
Compound containing oxygen
11
Chemical element in table salt
Down
2
Reddish electrical conductor
3
Blocking of light by a celestial body
7
Precious yellow metallic element
10
Path of a planet around the sun
12
Tissue that contracts for movement