Across
1
Element found in all living things
4
The Red Planet
6
Absolute temperature scale unit
7
Naturally occurring inorganic solid
8
Path of a planet around the sun
10
Basic unit of life
12
Glass that splits light into spectrum
Down
2
Tissue that contracts for movement
3
Reddish electrical conductor
5
Unit of energy
9
Compound containing oxygen
11
Substance with pH below 7
13
Biological catalyst