Can I make the carbon cycle shorter - by metamorphosis from plant to animal and vice-versa
EDITED to address the above suggestion. See below.
Most animals breathe in oxygen and breathe out carbon-dioxide.
Most plants take in carbon-dioxide and release oxygen.
Waste products from animals fertilise the soil and enable plants to grow.
Plants are eaten by herbivores.
I'm looking to create a world where this cycle is abbreviated.
When an animal eats enough vegetation it puts down roots and becomes a plant.
When a plant absorbs sufficient nutrients it metamorphoses into an animal and starts walking around.
This previous question is similar in some respects -
A plant/fungus and an animal that form a single species?. However the question there is, "How feasible would this be to evolve? What selection pressures would promote this adaptation? The ancestral organism doesn't need to be an animal."
I am not interested in evolution or selection. I want to know about the mechanism of metamorphosis.
Question
Specifically what biological mechanisms would be needed for a photosynthetic plant to metamorphose into an oxygen breathing animal and vice-versa?
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