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Liza Mohapatra
Query: 9 / Answer: 14

04th Jul 2019 .

Mention the evolutionary significance of the following organisms.
(a) Shrews
(b) Lobefins
(c) Homo habilis
(d) Homo erectus
 
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Manjulata Das
Query: 9 / Answer: 14

04th Jul 2019 .

(a) Shrews -The first mammals evolved on the Earth were like shrews. Their fossils show that they were small sized, viviparous, more intelligent in sensing and avoiding dangers.
 
(b) Lobefins - These fishes were considered to be extinct 65 million years ago, until one was captured in 1938 in South Africa. They are considered living fossils as they evolved into first amphibians that lived both on land and water. They were ancestors of modern day frog and salamander.
 
(c) Homo habilis - Homo habilis (able or skillful man, the tool maker or handyman) evolved from Australopithecus. He lived in Africa about 2 million years ago. They had bipedal locomotion, omnivorous and moved erect. Homo erectus evolved from them.
 
(d) Homo erectus - They appeared about 1.5 million years ago in middle pleistocene in Java (1891).
H. erectus evolved from Homo habilis. He had erect posture, protruding jaws, small canine and large molar teeth. He hunted and perhaps knew use of fire.
 
 
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