Whales can be 50ft in length, weigh 20 tons, and have a appetite to match. A fully grown Saman tree such as one might see in the grounds of the University of the West Indies in Trinidad will have the same dimension, and the same appetite. Whales consume krill and other small forms of marine life in vast quantities and breathe out vast quantities of carbon dioxide. Trees (and all plants containing chlorophyll) consume vast quantities of carbon dioxide and give off oxygen.
All forms of animal life require oxygen to survive and all forms of plant life require carbon dioxide to survive. Plants and animals complement each other and are totally dependent on each other.
Most successful gardeners now have an instinctive knowledge of the fundamental facts which make for being a successful gardener. If they did