Across
1
Disturbance that transfers energy
3
Preserved remains of ancient life
5
Compound containing oxygen
6
Nerve cell in the brain
7
Gas essential for breathing
Down
2
Ball of burning gas in space
4
Biological catalyst
8
Center of an atom or cell
Disturbance that transfers energy
Preserved remains of ancient life
Compound containing oxygen
Nerve cell in the brain
Gas essential for breathing
Ball of burning gas in space
Biological catalyst
Center of an atom or cell