Question

prokaryotic and eukaryotic cells
options (dropdown): binary fission, miller-urey experiment, endosymbiotic theory, abiogenesis theory
question (partial): proposed that cells engulfed smaller ones and used them to help with cellular functions. this phenomenon is termed the

Explanation:

The question is about the theory explaining how cells engulfed smaller ones and used them for cellular functions. The endosymbiotic theory proposes that eukaryotic cells evolved from prokaryotic cells engulfing other prokaryotes (like mitochondria and chloroplasts' ancestors) and forming a symbiotic relationship. Binary fission is cell division in prokaryotes, Miller - Urey experiment is about abiotic synthesis of organic compounds, and abiogenesis theory is about life originating from non - living matter. So the correct option is endosymbiotic theory.

Answer:

endosymbiotic theory