Question

9) How are birds and insects adapted for flying?
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Answer 1

Answer:

Hope it helps you mate .....

Explanation:

The bodies of birds are adapted for flying. Many of a bird's bones are less dense than human bones, which makes birds' bodies lightweight. Flying birds have large chest muscles that move the wings. ... The air sacs enable birds to extract much more oxygen from each breath of air than other animals can.

Answer 2

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• ᴛʜᴇ ʙᴏᴅɪᴇs ᴏғ ʙɪʀᴅs ᴀʀᴇ ᴀᴅᴀᴘᴛᴇᴅ ғᴏʀ ғʟʏɪɴɢ. ᴍᴀɴʏ ᴏғ ᴀ ʙɪʀᴅ's ʙᴏɴᴇs ᴀʀᴇ ʟᴇss ᴅᴇɴsᴇ ᴛʜᴀɴ ʜᴜᴍᴀɴ ʙᴏɴᴇs, ᴡʜɪᴄʜ ᴍᴀᴋᴇs ʙɪʀᴅs' ʙᴏᴅɪᴇs ʟɪɢʜᴛᴡᴇɪɢʜᴛ.
• ғʟʏɪɴɢ ʙɪʀᴅs ʜᴀᴠᴇ ʟᴀʀɢᴇ ᴄʜᴇsᴛ ᴍᴜsᴄʟᴇs ᴛʜᴀᴛ ᴍᴏᴠᴇ ᴛʜᴇ ᴡɪɴɢs.
• ᴛʜᴇ ᴀɪʀ sᴀᴄs ᴇɴᴀʙʟᴇ ʙɪʀᴅs ᴛᴏ ᴇxᴛʀᴀᴄᴛ ᴍᴜᴄʜ ᴍᴏʀᴇ ᴏxʏɢᴇɴ ғʀᴏᴍ ᴇᴀᴄʜ ʙʀᴇᴀᴛʜ ᴏғ ᴀɪʀ ᴛʜᴀɴ ᴏᴛʜᴇʀ ᴀɴɪᴍᴀʟs ᴄᴀɴ.