give reason for the following
a. forelimbs of birds r modified...
b. echidna n platpus lay eggs but r considered as mammals
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a) forelimbs of birds are modified into wings that help them to fly. these wings exert a downward force that help the bird to lift up.
b) Echidna and platypus lay eggs but are considered as mammals because these two animals show certain characteristics that are similar to mammals for example :-- Echidna and platypus both have hair all over their body which is the characteristic of mammal.
b) Echidna and platypus lay eggs but are considered as mammals because these two animals show certain characteristics that are similar to mammals for example :-- Echidna and platypus both have hair all over their body which is the characteristic of mammal.
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