The greatest evolutionary change enabling the land vertebrates to be completely free from the water. Habitat was the development of
Four legs
Four-chambered heart
Lungs
Shelled eggs and internal fertilization
Assertion : From evolutionary point of view, human gestation period is believed to be shortening.
Reason : One major evolutionary trend in humans has been the larger head undergoing relatively faster growth rate in the foetal stage.
Wings of pigeon, mosquito and bat show
According to Darwin, the organic evolution is due to
Which one is related to the cultural evolution of human