What fundamental biological characteristic dictates the White Marlin's life as a predator under Kingdom Animalia?
Answer
Being heterotrophic, consuming other organisms for energy
Membership in the Kingdom Animalia defines the White Marlin as a multicellular, eukaryotic organism that is heterotrophic. This means the organism lacks the cellular machinery necessary to synthesize its own nutritional needs, such as through photosynthesis, which is characteristic of the Plant Kingdom. Consequently, to sustain its highly active and high-energy lifestyle in the open ocean, the White Marlin must actively seek out and consume other organisms, positioning it fundamentally as a predator within the marine ecosystem structure.

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