Which type of interaction is described below? interactions occur between individuals of the same species

Can someone i have no idea of how to do this.

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

Closing romer’s gap. what is the significance of the new fossil evidence found in scotland? answer in claim evidence and reasoning