Across
1
Basic unit of life
3
Smallest unit of an element
5
Tissue that contracts for movement
6
Unit of force
8
Center of an atom or cell
10
Nerve cell in the brain
Down
2
Disturbance that transfers energy
4
Biological catalyst
5
Molten rock beneath Earth surface
7
Naturally occurring inorganic solid
9
Form of thermal energy
11
Gas essential for breathing