Across
1
Group of similar cells
4
Element found in all living things
7
Force that attracts objects together
8
Our home planet
11
Basic unit of life
12
Unit of heredity
Down
2
Mass per unit volume
3
Measure of matter in an object
5
Absolute temperature scale unit
6
Amplified beam of light
9
Substance with pH above 7
10
Biological catalyst