human evolution

origin and evolution of man

 note:when we look at human skull of a baby adult chimpanzee baby look like similar to human skull then other chimpanzee showing common ancesstor 

 sequence of human origin are 

1. dryopithecus
2. ramapithecus
3. austriopithecus
4. homohabilus
5. homoerectus
6. neanderthal
7. cromagnon
8. homosapiens   
   
   
   

1.dryopithecus:-15 millions years ago direct ancesstor of apes

.full body are covered with hair more look like apes 

2. ramapithecus:-15 million years stay  

. more look like a human but not exactly

. hair and fossils are found in shivalik hill india 

3.austriopithecus:-

.500 cranial capacity

. first time start  2 feet movement 

.they were 4 feet in height lived in african grassland

.fossisls obtained from ethopia, tanzania 

.made stone weapon to eat food.

4.homohabilus :-

. hominid like a human 

.they look like a able man 

.they are perfect tool maker 

.they probably did not eat meat

.650-800 cranial capacity

5.homoerectus:-

.900 cranial capacity 

. first time show errect postures

.used fire probably they eat meat 

.fossils obtained from china and also island of java in 1891

 6. neanderthal:-

. mostly lived in central east asia 4000-1 lakh years ago

.1400 cranial capacity

 first time covered their body and their dead one put flower on them

7.cromagnon :-

.cranial capacity around 1600

.direct ancesstor of today modern man  they first made cave painting  .in18000 years ago cave painting was obtained from raisan dristrict of madhya pradesh.

8.homosapiens :-

.75000-10000 years 

.ice age when they are arose 

.they first brought agriculture revolution human sattlement industrial revolution etc .

.1350 cranial capacity 

brief account of evolution

universe are 20 billions years ago and earth  4.5 billions years ago invertebrates 50 millions years ago , jawless fish 350 millions years ago sea weed and few plant 320 millions years ago first oraganism that are found in land were plant .in 1938 a fish caught in south africa coelacanth which was thought to be extint  lobe fins envolved into the first amphibians that lived on both land and water .reptiles are200 millions years dominant on the earth .some of reptiles went back into water  and some of not for eg. ichthyosaurs .the biggest of them is tyrannosaurus rex was abouth 20 feet in height and had huge  dagger like teeth  dinosours disappeared from earth 65 million years ago

 first mammal are shrews  their fossils are very small in sized  mammals are viviparous and protect their young ones in mother body. in australia pouched mammals are survived due to no other mammals are dominant .

note# initially 7 continent common land called pangea 

due to continental drift land are seperated due to this south america joined north america mammals like hippo, horse,rabbit etc in south america  but later it joined in north america fauna [animal] are dominated