3 MILLION YEARS AGO, AUSTRALOPITHECUS AFARENSIS AND LUCY HAD VANISHED

ABSTRACT

By the three million years ago, the world Lucy and Australopithecus afarensis had vanished. This was happened due to earth climate change. During this period earths became cooling. Temperature in Africa change and the earth stripped of moisture. This cause the disturbance in the environment.

SPINNING AROUND
The earth orbits around the sun, known as the axis of rotation. During three million years ago axis was changing. So the earth pointed away from the sun for a longer period which causes the overall cooling of earth, locking away moisture in ice at the North and South Poles. It also made the climate more seasonal and the earth dried out. The cause of this environmental upheaval was to be found in space. As our planet spins, it points towards the Sun at some times and away from it . This is the origin of the seasons on Earth.

DIETARY DILEMMA

In Africa some animals that relied on forest died out because it was too dry. For example, during this period the Australopithecus Afarensis and Lucy had disappeared because this species fail survive in that situation. This species died as they were relied on forest. But other species evolved by explore ding different dietary sources that were available in that time. For example, many evolved physical adaptations to graze on the new species of plant life called grass that colonised the deforested terrain. Wildlife in Africa diversified as new animal species evolved to exploit different sources of food in a new mosaic of environments.
The same seems to have happened to our ancestors, who had previously relied on forest foods such as soft fruit. After three million years, new ape-men were springing up all over the continent.
Humid woodland shrivelled away, leaving wide belts of open terrain in its place. During this time species such as Paranthropus Boisei developed an enormous jaw with huge back teeth to grind down the tough plants food,  Forces were transforming the earth climate with devastating consequences for the African landscape.
Although Australopithecus Afarensis lived in eastern Africa, No tools of any kind have been found with A. Afarensis. During 3 million years ago Australopithecus Afarensis evolved in australopithecines. A. Afarensis possessed a brain similar to predecessor. The sizes of chewing teeth remain large.By 2.8 million years, humid woodland had shrivelled away, leaving wide belts of open terrain in its place.

The cause of this environmental upheaval was to be found in space. The Earth orbits the Sun at a slight tilt, known as the axis of rotation. This means that as our planet spins, it points towards the Sun at some times and away from it at others. This is the origin of the seasons on Earth.

 

Linette Netshiheni
CSIR Pretoria
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Cell: 0820446442
Tell: 012 841 2133
Fax: 012 842 3676
tnetshiheni@csir.co.za
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