Across
1
Biological catalyst
5
Chemical element in table salt
6
Element found in all living things
9
Push or pull on an object
10
Our home planet
Down
2
Icy body with a tail near the sun
3
Gas essential for breathing
4
Substance with pH above 7
6
Basic unit of life
7
Group of similar cells
8
Mass per unit volume
11
Glass that splits light into spectrum