why do birds have hollow bones and why protists have appendages like cillia and flagela

Asked by Shagun Rastogi | 27th Dec, 2013, 03:05: PM

Expert Answer:

Birds have hollow bones since the bones give them some added strength. Birds fly so well because they have well developed skeletons which are particularly light and strong, thus enabling them to fly for long distances.
Protists have flagella, cilia which are all the forms of appendages. They are used for locomotion and, in the case of pseudopodia, for engulfing food (endocytosis).

Answered by Sivanand Patnaik | 28th Dec, 2013, 08:26: AM

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