(a)fossils provide an explanation for evolution.some dinosaurs had feathers tht provided dem insulation in cold weather,bt they cud not use dem for flyin purpose.birds seem 2 hv later used feathers 2 fly.dis means tht birds r very closely relatd 2 reptiles which suggests tht birds hv evolved frm reptiles.
(b)some animals hv commn features cuz all organisms hv into being b evolution frm a commn ancestor. similarities and disimmilarities r determind on d presence or absence of a characteristic in an organism,.
Based on dis they r classified into grps.....................
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