A second set of channels, the phloem, found just under a tree's bark, carries the products of photosynthesis to the roots.
These waste products of photosynthesis began to build up as time went on, in a sense polluting the environment.
There are signs that intracellular algae may be directly providing the products of photosynthesis to the salamander cells that encapsulate them.
The products of photosynthesis are also converted into other complex substances.