An anthropologist finds a fossil that is 4 million years old. its pelvis suggests it walked upright. which species could the specimen belong to?
answer choices are
australopithecus africanus
australopithecus afarensis
homo habilis
homo erectus

Option B, Australopithecus afarensis

Explanation:

Australopithecus afarensis is one of the oldest and long lived species of early human being with small canine teeth and a body which consists of two legs and walked upright regularly.  

Their body shape followed bipedalism and it comes from skeletal fossils inclusive of articulation and femur just like human beings. Their fossilised footprint showed that they it do not have knuckle-dragging impressions

Hence, option B is correct

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.