Post No: 7
Answer lies in prehistory, anthropology and archaeology. Let me explain in simple words.
Actually, Humans diverged and evolved from long lineage with its closest living relative, Chimpanzees.
Human face consists of multiple layers, hard solid bone, skull at base, muscles mounted at both ends on bones is the flexible and deformable layer, fascia surface, dermal-fatty layer variable tissue depth depends on health and environmental conditions and the top epidermal surface also called as skin. In simple words face is surface wrapped on skull, thus skull can be considered as the framework of face.
Human face consists of multiple layers, hard solid bone, skull at base, muscles mounted at both ends on bones is the flexible and deformable layer, fascia surface, dermal-fatty layer variable tissue depth depends on health and environmental conditions and the top epidermal surface also called as skin. In simple words face is surface wrapped on skull, thus skull can be considered as the framework of face.
Although as late as the time of 'Charles Darwin', was common to find people who thought there was a independent creation of every species and life form do not change from one generation to another. But Darwin’s five theories suggested :
- Evolution: species come and go through time, while they exist they change.
- Common descent: organisms are descended from one, or several common ancestors and have diversified from this original stock
- Species multiply: the diversification of life involves populations of one species diverging until they become two separate species; this has probably occurred billions of times on earth!
- Gradualism: evolutionary change occurs through incremental small changes within populations; new species are not created suddenly.
- Natural selection: evolutionary change occurs through variation between individuals; some variants give the individual an extra survival probability.
Plan your visit to Smithsonian National Museum of natural History to have a look at preseved evidences of human origin.
Sometime between 7 and 6 million years ago
 |
| Image Credit: Karen Carr Studio |
Orrorin tugenensis
Sometime between 6.2 and 5.8 million years ago
Between about 5.8 and 5.2 million years ago
 |
| Image Credit: Karen Carr Studio |
About 4.4 million years ago
About 4.2 to 3.9 million years ago
 |
| Image Credit: John Gurche, artist / Chip Clark, photographer |
Between about 3.85 and 2.95 million years ago
 |
| Image Credit: John Gurche, artist / Chip Clark, photographer |
About 3.3 to 2.1 million years ago
 |
| Image Credit: Karen Carr Studio |
 |
| Image Credit: Karen Carr Studio |
 |
| Image Credit: Karen Carr Studio |
 |
| Image Credit: John Gurche, artist / Chip Clark, photographer |
 |
| Image Credit: John Gurche, artist / Chip Clark, photographer |
 |
| Image Credit: John Gurche, artist / Chip Clark, photographer |
 |
| Image Credit: John Gurche, artist / Chip Clark, photographer |
 |
| Image Credit: John Gurche, artist / Chip Clark, photographer |
 |
| Image Credit: Human Origins Program, Smithsonian Institution |
Following link shows the Human Family Tree and other variations of human faces.
http://humanorigins.si.edu/evidence/human-family-tree
Biology teacher Andrew Douch makes comparisions between the skull of an ancient Hominin (Australopithecus afarensis) and a modern hominin ( Homo sapiens)
But What's next?
Fossil skull challenges understanding of human evolution http://www.theguardian.com/science/video/2013/oct/17/fossil-skull-human-evolution-homo-erectus-video
ReplyDelete