How. is the structure of a unicellular organism different than the structure of a multicellular organism? how does this affect function? pls i've asked this question 3 times already : /

Australopithecus robustus was likely the longest-surviving species of australopithecine in south africa. it had: a. large molars, a big face, and a sagittal crest. b. a large body, large teeth, and a sagittal crest. c. a big brain, big teeth, and a big face. d. a big face, large teeth, and a large body