TOEFL Academic Passage Practice #002 -… | English Rhino
TOEFL Academic Passage Practice #002 - TOEFL Vocabulary Quiz #2: Essential Words [Premium]
Marine biologists have long been fascinated by the phenomenon of bioluminescence, a natural process through which certain organisms produce light. This ability serves multiple purposes, including attracting prey, deterring predators, and facilitating communication. The chemical reactions involved are remarkably complex, involving enzymes and substrates that produce light without generating heat.
1. The word “complex” in the passage is closest in meaning to
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