Across
1
Element found in all living things
5
Hottest planet in solar system
6
Mass per unit volume
7
Infectious microscopic agent
8
Basic unit of life
11
Force that attracts objects together
12
Reddish electrical conductor
13
Biological catalyst
Down
2
Compound containing oxygen
3
Tectonic landmass section
4
Absolute temperature scale unit
9
Glass that splits light into spectrum
10
Nerve cell in the brain