Final answer:
Autotrophic organisms obtained energy through photosynthesis, converting sunlight into food. Heterotrophic consumption of organic molecules also provided energy to early life forms.
Explanation:
Autotrophic organisms, through photosynthesis, were the first to obtain energy on Earth by converting sunlight into food from carbon dioxide and water. This allowed them to provide sustenance for themselves and other organisms. Additionally, early life forms obtained energy through heterotrophic consumption of organic molecules from their environment.
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