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Connecting link

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(i) Some plants and animals show some morophological characters by which they can be related to two different groups, hence they are called connecting links.
(ii) E.g. In Peripatus, characters like segmented body, thin cuticle and parapodia are present like annelida and worms. Similarly, these animals show tracheal respiration and open circulatory system similar to arthropods. This indicates that Peripatus is the connecting link between annelida and arthropoda.
(iii) Similarly, Duck Billed Platypus lays eggs like reptlies but shows relationship with mammals to due to presence of mammary glands and hair.
(iv) Lung fish performs respiration with lungs irrespective of being a fish.
(v) These examples indicate that mammals have evolved from reptiles and amphibians from fishes.
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Knowledge Check

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