Across
1
Center of an atom or cell
5
Curved glass that refracts light
6
Unit of force
8
Second lightest element
Down
2
Group of similar cells
3
Infectious microscopic agent
4
Unit of electric potential
7
Tissue that contracts for movement
Center of an atom or cell
Curved glass that refracts light
Unit of force
Second lightest element
Group of similar cells
Infectious microscopic agent
Unit of electric potential
Tissue that contracts for movement