Many mountains have a tree line, which is an imaginary line above which trees will not grow. Hypothesize why some mountains have tree lines and what the trees at the tree line might look like.

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