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84 terms

Human Evolution Ncea Level 3

Combined all terms from search results. May add to it.
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Australopithecus
Group of extinct omnivorous bipedal hominins. Includes A. anamensis, afarensis, africanus and some others.
Biological evolution
Evolution of bone, muscle, physiology and inherited behaviour. To be distinguished from cultural evolution.
Bipedalism
Walking on 2 legs. Only Australopithecus, Paranthropus and Homo genuses.
Brachiation
Swinging by arms as apes do.
Broca's area
Area of brain that produces speech.
Brow ridge
Bony projection protecting eyes. Prominent in early hominins.
Burin
Tool used for making holes in skins, etc.
Condyle
Buttress of bone on the base of the femur. Humans have this on the outer base and apes on the inner. It prevents collapse of the knee inwards.
Cranium
Raised back of skull holding brain.
Cultural evolution
Evolution of culture (weapons, tools, art, music, ritual, etc.).
Diastema
Gap between incisors and canines to allow for space for the large canines.
Dryomorph
Early form of ape ancestral to both apes and humans.
Foramen magnum
Opening in the skull for attachment of the spinal cord.
Hominid
Family that includes apes and humans.
Hominin
Hominin Tribe (below subfamily) that includes humans and bipedal fossils like Australopithecus and Paranthropus. Also called hominid.
Mesolithic
Middle Stone Age, characterized by fishing and foraging for wild grains.
Mousterian
Tool culture of Neanderthals.
Neolithic
New Stone Age — age of agriculture.
Nuchal crest
Attachment at the back of the skull for attachment of neck muscles.
Olduwan
Tool culture of Homo habilis.
Palaeolithic
Old Stone Age.
Paranthropus
Genus of vegetarian hominins includes P. aethiopicus, robustus and boisei.
Ponginae
Subfamily that contains orangutans.
Primate
Order that includes prosimians, monkeys, apes and humans.
Prognathism
Having a protruding muzzle.
Prosimian
Primitive monkey, eg lemur, loris, tarsier. Small, often solitary, nocturnal.
Quern stone
Rounded stone used for grinding grains into flour.
Sagittal crest
Bony projection on top of the cranium for attachment of chewing muscles.
Selection pressures
The environmental factors that favour certain phenotypes over others. (See the chapter on Evolution for more on this.)
Sexual dimorphism
Where the male is larger and has structural differences from the female.
Simian
Monkey-like.
Upper Palaeolithic
Culture of Homo sapiens.
Valgus angle
Carrying angle; the angle, less than 180°, between the femur and tibia. It indicates bipedalism.
Wernicke's area
Area in the brain concerned with recognition of speech.
Zygomatic arch
Bone structure on side of cheek through which the chewing muscles go.
Acheulian
Tool culture of Homo erectus and archaic H. sapiens. Pear-shaped hand axes.
Ape
Includes gorilla, orangutan, gibbon and chimpanzee. No tail, large brain; brachiating knuckle walkers.
Bipedalisim Advantages
Thermoregulation, Carrying Objects, Height, Energy Efficient
Biological Evolution
(transmission of factors inherited from parents)
Cultural Evolution
(transmission of beliefs, ideas, knowledge by learning from other members of group) Tools, Fire, Shelter, Clothing, Food-Gathering, Abstract thought, Domestication of plants and animals.
H - Feet
Arched (shock absorbing; walk longer distances). Toes face forward, longer big toe (provides thrust). Big heel bone (firm base to push against for walking/running)
A - Feet
Flat feet, big toe separate, facing outwards from foot and opposable (grasping branches and climbing trees)
H - Femur,Knee Joint, Valgus Angle
Femur hangs inward angle from hip (center of gravity between feet) Knee Joint (maintains centre of gravity) Buttresses (creates valgus angle, prevents sideways movemetn of lower leg)
A - Femur,Knee Joint, Valgus Angle
Femur hangs vertically from hip, knee joint, no buttresses or valgus angle (gives better swinging motion in branches)
HvA - Spine
H: S shape (keeps body weight above hip joints) A: Slightly curved (counterbalances downward force of organs and chest)
HvA - Chest
H: Flattened front to back, oval in cross-section (body weight brought close to spine and over centre of gravity. A: Rounded front to back, circular on cross-section (organs supported by rubs and large abdominal muscles)
HvA - Hands
H: Fully opposable thumb, straight fingers (manipulative precision grip). A: Short, opposable thumb and curved fingers (power grip and hooking)
H - Skull External
Foramen magnum at centre of base of skull (skull balances at top of spine). No brow ridges, sagittal crest or nuchal crest.
A - Skull External
Foramen magnum and back of skull, large brow ridges, sagittal crest, nuchal crest.
H - Teeth and Jaws
Smaller teeth and jaws (tools cutting up and fire softening). Enamel thicker and canines small. Jaw and tooth row more parabolic shaped.
A - Teeth and Jaws
Larger teeth and jaws, large canines (display, sexual diapmorphism) distema on upper tooth row, jaw and tooth row U shape.
H - Endocranial
Cranium volume 1400, Speacialised areas: Cerebellum (balance, swelling at back), Cerebrum (thinking skills, top surface expanded and folded), Broca's area (speech production), Wernicke's area (understanding speecha and writing) both swelling left side.
A - Endocranial
Cranium volume 450, atter on top, no specialised areas developed.
HvA - Pharynx and Larynx
H: longer P, lower L (modifies sound and tone of speech). A: shorter P, higher L (modification of tone and sound cannot occur)
HvA - Hair and Skin
H: finer and shorter hair but same number per cm3 and more sweat glands (cooling capacity for higher activity rates). A: thicker hairs, fewer sweat glands (insulation from sun, lower activity rates)
HvA - Pelvis
H: short and wide (reduces stress of upper body weight in hips, supports abdominal organs). A: tall and narrow (large surface area for leg muscle placement)
Australopithecus
A genus dating from 4-1million years ago. Also known as the southern ape. Brain size <500cc (cubic centimeters)
Homo
Genus to which humans below. Ranging from 2 million years ago (mya) to the present day. Brain size >600cc
Australopithecus afarensis
Southern ape from the afar desert. Earliest fossil 4-2.8 million years ago. Remains found in Ethiopia and Sth Tanzania. Small stature, brain size similar to chimp. Bipedal, ape-like face (elongated, pronounced brow ridges).
Small, ape-like face (elongated, pronounced brow ridges), brain size chimp, free hands, walk upright,
Features of A. afarensis
Australopithecus africanus
Lived from 3-2mya. Similar features to A. afarensis. Stature; bipedal, small brain, flatter face, large molars (plant based diet), brow ridges.
4-2.8mya
Timeline of A. Afarensis
Australopithecus robustus
2.4-1.4 mya. Larger stature & bones, more muscular. V. large molars. Small brain
2.4-1.4mya
Timeline for A. robustus
similar to A. afarensis, brain slightly larger, large molars
features of A. africanus
Large and heavily built, large bones & skull, v. large molars, small brain
features of A. robustus
Homo habilis
The 'handy man', first to use very primitive tools. Approx 2mya. East Africa. Stature; smaller teeth and jaw, human size, dominant brow ridge, sloping skull. Brain size approz 600cc
approx 2mya
Timeline for H. habilis
Smaller teeth and jaw, human size, dominant brow ridge, sloping skull, brain size approx 600cc
features of H. habilis
Homo erectus
The direct ancestors of Homo Sapiens. Approx 1mya. Migrated to other parts of africa. Less hairy, no chin, arches over eyes. Larger brain (1000cc) with more cortex allowing higher functioning. More complex tools. Teeth changed to meat eaters
brain 1000cc, less hairy, no chin, arches over eyes
features of H. erectus
Homo sapiens
Our species. Physical features: Flat high dome forehead, no arches over eyes, 1300cc brain.
Neck
Foramen magnum is more anterior/ less robust neck muscles
Spine
backward thoracic curve/ forward lumbar curve/ keeps trunk centered about the pelvis
Pelvis
basin shaped to support internal organs/ iliac blades shorter and broader/ stabilizes weight transmission
Limbs
lower limbs elongated/ thigh 20% humans, 11% gorillas
Femur
angled inward/ legs more directly under the body/ modified knee joint helps to extend it fully
Foot
enlarged and inwardly placed big toe/ longitudinal arch absorbs shock and spring to step
Teeth
reduced canine, smaller incisors
opposable thumb
when thumb can touch fore fingers, only primates have these features.
arboreal life
life in the trees, opposable thumb was important in result of this
hominoids
all apes and humans
hominid
early ancestor on human family tree
bipedalism
walking on two feet