Input (grade 13): The seeds are released from their woody capsules (gumnuts) by heat and for successful germination the seedlings require a high level of light, much more than reaches the forest floor when there is a mature tree canopy.
Output (grade 6): They grow only from seed which are released from their woody gumnuts by heat. The seedlings need a lot of light, much more than reaches the forest floor normally when there are mature trees blocking the sun.