Across
1
Tissue that contracts for movement
5
Form of thermal energy
6
Unit of heredity
7
Measure of matter in an object
9
Naturally occurring inorganic solid
11
Chemical element in table salt
12
Substance with pH below 7
Down
2
Infectious microscopic agent
3
Group of similar cells
4
Icy body with a tail near the sun
8
Nerve cell in the brain
10
Push or pull on an object
13
Substance with pH above 7