Across
1
Tissue that contracts for movement
5
Icy body with a tail near the sun
6
Nerve cell in the brain
9
Unit of heredity
11
Measure of matter in an object
12
Substance with pH above 7
Down
2
Curved glass that refracts light
3
Smallest unit of an element
4
Tectonic landmass section
6
Unit of force
7
Push or pull on an object
8
Gas essential for breathing
10
Chemical element in table salt