2) Consider that Paranthropus and Homo coexisted in eastern and South Africa. If a species like A. africanus is ancestral to both Homo and Paranthropus, what do you think the divergent morphological features of the masticatory apparatus in each lineage imply about dietary differences between Homo and Paranthropus?

As per the differences in the dental structures and the masticatory apparatus, the diet preferences of the Paranthropus and the Homo differed pretty much.

This might be due to different living conditions, different geographical ranges and adaptations.

Paranthropus ate lesser meat diet than A. africanus and had very hard food intake like nuts and seeds, as they had lesser canine area but huge molar areas.

But Homo had invented fire by the time and the need for molars to grind hard foods wasn't much. Their canine and the molar area was the least among Paranthropus and africanus and their food was cooked on fire so only incisors to chew them were necessary.

The dental size of Homo species decreased considerably over the evolutionary time.