No Time for Sergeants - 1964 Whortleberry Roots for Everyone 1-31 was released on:
USA: 12 April 1965
Plants release water by transpiration
Roots Unknown - 2008 was released on: USA: April 2008
Release oxygen
Roots - 1977 1-1 was released on: USA: 1977
Rhythm and Roots - 2010 was released on: USA: 1 January 2010
Journey to the Roots of Beauty - 2011 was released on: USA: 2011
Grass Roots - 2010 was released on: USA: 10 October 2010
Roots - 1977 1-2 was released on: USA: 1977
Roots - 1977 1-3 was released on: USA: 1977
Roots - 1977 1-6 was released on: USA: 1977
Roots - 1977 1-7 was released on: USA: 1977
So the trees can get oxygen and release CO2. The roots grow up out of the soil to reach oxygen.