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A trend may be progressive (a general increase in size of organs) or retrogressive (a general degeneration and loss of organs).
Thus Huxley is justified in calling ‘birds are the glorified reptiles’.(b) Ichthyostega: It is a primitive fossil amphibian and is a missing link between fishes and amphibians.(c) Seymouria: It was a “missing link” between amphibians and reptiles.(d) Lycaenops: It was a mammal-like reptile.It displays the characters of both the reptiles and birds.Reptilian Characters of Archaeopteryx: (a) The body axis is more or less lizard-like,(b) The two jaws are modified into a beak,(c) The fore limbs are modified into wings,(d) The hind-limbs are built on the typical avian plan,(e) An intimate fusion of the skull bones as seen in the birds.On the basis of fossil study, it has been shown that the early organisms were very different from their modern forms, viz., the early man lived in the caves without any social life and spent their life like beasts, but man progressed and the modem man has become civilized, and leads a vigorous social life.Thus, the organisms have been changing since their appearance, which supports that evolution has been taking place.
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