Across
1
Basic unit of life
4
Icy body with a tail near the sun
6
Gas essential for breathing
7
Group of similar cells
Down
2
Biological catalyst
3
Unit of electric potential
5
Smallest unit of an element
8
Force that attracts objects together
Basic unit of life
Icy body with a tail near the sun
Gas essential for breathing
Group of similar cells
Biological catalyst
Unit of electric potential
Smallest unit of an element
Force that attracts objects together