Human evolution shows the following trends:

A. Brain size: It increased gradually along with evolution. The brain capacity of Australopithecus africanus - 500 cc, Homo habilis - 700 cc, Homo erectus – 800 - 1300 cc, Homo sapiens sapiens - 1450 cc.

B. Skeletal structure:

• Dryopithecus was ape-like, without brow ridges, had semierect posture, and prognathous face (having a projecting jaw).
• Ramapithecus had jaws and teeth like humans (small canines and large molars), prognathous face, and walked on legs.
• Australopithecus africanus had erect posture, human-like teeth, was without chin, with brow ridges, and had a prognathous face.
• Homo habilis walked nearly erect, had human-like teeth, with brow ridges face was slightly prognathous.
• Homo erectus had an erect posture, prognathous face, with projecting brow ridges, small canines, and large molar teeth and had a small chin.
• Homo sapiens had four curves in the vertebral column, orthognathous face (without projecting jaw), forehead broad, chin well developed, walked on the sole.

C. Dietary preference: Dryopithecus and Ram-apithecus were herbivores, Australopithecus africanus and Homo habilis were carnivores, Homo erectus and Homo sapiens were omnivores.