Step One: Anatomical Developments Match the following anatomical developments (A-J) with the number where they occur on the Hominin Anatomy Phylogeny (below).
A. decreased prognathism, moderate sized molars, phalanges not curved (derived), Found in South Africa, still relatively small brain (-450cc)
B. canine reduction, lower jaw tooth row shape intermediate between parallel and parabolic, have footprints explicitly displaying bipedal
patterns, curved phalanges
C. further brain expansion, decrease in teeth size, decrease in brow ridges, flattening of the face, mental eminence, vertical forehead
D. megadontia complex (huge molars, jaws, and chewing muscles), slight increase in cranial capacity (410-530cc)
E. femur and pelvis indicate capable of bipedalism
F. brain expansion, megadontia reduction, smaller less projecting face, smaller jaws
G. occipital bun common, retromolar space, robust postcrania, relatively short limbs
H. further brain expansion, reduction in teeth, face, and jaws, increased brow ridges, increased body size
1. loss of honing complex, obligate bipedalism, curved phalanges (primitive), parallel tooth row shape
J. foramen magnum position indicates likely capable of bipedalism

A. Hoomo ergaster & Hoomoo erectus

B. Hoomoo erectus

C. Hoomoo ergaster

D. Hoomoo Habilis

E. Hoomoo ergaster and Hooomo erectus

F. Hoomo Habilis

G. Hoomoo erectus

H. Hoomoo ergaster

I. Hoomoo ergaster and Hoomoo erectus

J. Hoomoo erectus

Homooo erectus fossils are found in China and Indonesia. They have widest part of brain case at cranial base.

They have reduced post canine and decrease jaw size. They have shorter forelimbs and are bipeds.

Homooo habiliss are dimorphic species which have long forelimbs and shorter forelimbs.

Learn more at

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.