Why do ecosystems require continuous input of enery from the sun and what is the process that converts the sun energy vhemical energy?

the answer is The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants. A small proportion of this chemical energy is transformed directly into heat when compounds are broken down during resp​iration in plants

Explanation:

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a bird that nests only in a particular tree species.