Across
1
Unit of energy
4
Chemical element in table salt
5
Unit of force
6
Element found in all living things
Down
2
Group of similar cells
3
Center of an atom or cell
7
Mass per unit volume
8
Biological catalyst
9
Smallest unit of an element
Unit of energy
Chemical element in table salt
Unit of force
Element found in all living things
Group of similar cells
Center of an atom or cell
Mass per unit volume
Biological catalyst
Smallest unit of an element