Transcript of Feathers claws thin ribs teeth long tail wing-like forelimbs Reptile-like features Bird-like...
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- feathers claws thin ribs teeth long tail wing-like forelimbs
Reptile-like features Bird-like features Replica of Archaeopteryx
fossil; half bird half reptile 16
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- Vertebrates Fish, amphibia, reptiles, birds and mammals all
have vertebral columns, skulls, brains, circulatory systems and
many other features in common This suggests that they all arose
from a common ancestral form rather than arising independently. The
same reasoning can be applied to other groups of organisms such as
insects which have most of their anatomical features in common
Although these features are superficially different there is a
basic pattern underlying them all 18
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- Vertebrate limbs The basic pattern of the vertebrate limb is
represented by the human arm skeleton shown below ball and socket
joint hinge joint single bone two bones group of small bones five
jointed digits 17
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- The forelimbs of the following vertebrates show the basic
pattern of limb bones with modifications which are adapted to their
methods of locomotion. LizardBird DolphinBat The basic pattern
suggests they have evolved from a common ancestor 19
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- Mammals Flatworms Annelids InsectsCoelenterates Fish Birds
Reptiles Crustacea Amphibia Single celled organisms
MonocotsHerbsShrubsTrees Dicots Flowering plants Conifers Mosses
LiverwortsAlgae Ferns Fungi Multicellular plants Multicellular
animals Mollusc 22