Across
1
Path of a planet around the sun
2
Smallest unit of an element
4
Unit of force
Down
2
Substance with pH below 7
3
Unit of energy
4
Nerve cell in the brain
5
Group of similar cells
6
Biological catalyst
Path of a planet around the sun
Smallest unit of an element
Unit of force
Substance with pH below 7
Unit of energy
Nerve cell in the brain
Group of similar cells
Biological catalyst