Across
1
Biological catalyst
4
Smallest unit of an element
5
Curved glass that refracts light
6
Tissue that contracts for movement
8
Substance with pH above 7
Down
2
Center of an atom or cell
3
Nerve cell in the brain
7
Unit of energy
Biological catalyst
Smallest unit of an element
Curved glass that refracts light
Tissue that contracts for movement
Substance with pH above 7
Center of an atom or cell
Nerve cell in the brain
Unit of energy