Multiple choice questions XVIII — task. Science CBSE, Class 9.

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1. Why do birds have hollow bones?

To make them carry young ones and fly faster
To make their bone healthy and stabilise their movement
To make their body healthy and transport the nutrients all over the body
To make their bodies light in weight and make flying easier

2. Which phylum includes organisms that have pharyngeal gill slits?

Phylum Echinodermata
Phylum Arthropoda
Phylum Mollusca
Phylum chordata

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