How did multicellular organisms evolve from unicellular organisms?
A. Single-celled organisms joined together, or failed to separate after cell division.
B. Single-celled organisms joined together only.
C. Single-celled organisms failed to separate after cell division only.
D. Single-celled organisms joined together, or absorbed other species by endosymbiosis.
E. One species absorbed another species by endosymbiosis only.
Ans: A. Single-celled organisms joined together, or failed to separate after cell division.
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