Across
1
Biological catalyst
3
Precious yellow metallic element
5
Tectonic landmass section
8
Absolute temperature scale unit
10
Preserved remains of ancient life
12
Substance with pH above 7
Down
2
Push or pull on an object
4
Reddish electrical conductor
6
Tissue that contracts for movement
7
Gas essential for breathing
9
Unit of power
11
Unit of heredity