The appearance of our ancestors varied significantly over time and across different regions. Here is a general overview:

Early Hominins (Australopithecus):

Body Structure:

Bipedal (walked on two legs)

Small brain size compared to modern humans

Long, ape-like arms

Hands with opposable thumbs

Features:

Protruding jaws and teeth

Thick brow ridges

Smaller skull compared to modern humans

Homo Habilis (2.4-1.4 million years ago):

Physical Traits:

Larger brain size than Australopithecus

Smaller teeth

More upright posture

Tool Use:

Known for using simple stone tools

Homo Erectus (1.9-0.1 million years ago):

Physical Traits:

Larger brain size than Homo habilis

More robust body structure

Thicker brow ridges

Less prominent jaws and teeth

Tool Use:

Advanced stone tool technology including hand axes, cleavers, and scrapers

Used fire

Homo Neanderthalensis (200,000-40,000 years ago):

Physical Traits:

Stockier build with shorter limbs compared to Homo sapiens

Broad chest and prominent ribcage

Large brow ridges

Sloping forehead

Large nasal cavity

Features:

Sophisticated stone tool technology, including tools for specialized purposes

Evidence of cultural practices such as burial rituals

Homo Sapiens (modern humans):

Physical Traits:

Largest brain size of all hominins

More upright posture

Reduced brow ridges

Smaller teeth and jaws

Features:

Highly complex language and culture

Capacity for advanced toolmaking and artistic expression

Diverse physical characteristics due to geographic variation and adaptation to different environments

It's important to note that the understanding of our ancestors' appearance is based on fragmentary fossil evidence, and there may be variations and uncertainties within each species.