The late Paleogene and early Neogene's changing climate likely contributed to our human ancestors' evolution in what way (with regards to bipedalism)? Select the answer that best fits.
Wait, humans are supposed walk on two legs?
None of the other answers fit.
the warmer, more humid climate caused increased dense jungle growth, which provided more fruit for our ape ancestors
the warmer, dryer climate caused expanding deserts, and removed all trees in regions that our ape ancestors lived
the cooler, dryer climate made forested area sparser and selected for apes that could travel more easily between forested areas