Question

compare between aves and pisces on the bases of reproduction

Answer 1

Aves breathe through O2 from air while Pisces take O2 from water which is in dissolved form.
I hope it will help you

Answer 2

✌️✌️ hey mate,

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➡️ᴄʜᴀʀᴀᴄᴛᴇʀɪsᴛɪᴄs ᴏғ ᴄʟᴀss ᴀᴠᴇs:

1⃣. ᴛʜᴇ ᴍᴇᴍʙᴇʀs ᴏғ ᴄʟᴀss ᴀᴠᴇs 
ᴀʀᴇ ᴄᴏᴍᴍᴏɴʟʏ ᴋɴᴏᴡɴ ᴀs ʙɪʀᴅs. 

2⃣. ᴛʜᴇɪʀ sᴋɪɴ ɪs ᴄᴏᴠᴇʀᴇᴅ ᴡɪᴛʜ
 ғᴇᴀᴛʜᴇʀs.

3⃣. ᴛʜᴇʏ ʙʀᴇᴀᴛʜ ᴡɪᴛʜ ᴛʜᴇɪʀ 
ᴍᴏᴜᴛʜ ᴏʀ ɴᴏsᴛʀɪʟs.

4⃣. ᴛʜᴇʏ ʜᴀᴠᴇ ғᴏᴜʀᴄʜᴀᴍʙᴇʀᴇᴅ 
ʜᴇᴀʀᴛ ᴀɴᴅ ᴇxʜɪʙɪᴛ ʜɪɢʜ ᴍᴇᴛᴀʙᴏʟɪᴄ
ʀᴀᴛᴇ.

➡️ᴄʜᴀʀᴀᴄᴛᴇʀɪsᴛɪᴄs ᴏғ ᴄʟᴀss ᴘɪsᴄᴇs:

1⃣. ᴛʜɪs ᴄʟᴀss ɪɴᴄʟᴜᴅᴇ ᴡᴀᴛᴇʀ 
ᴀɴɪᴍᴀʟs ᴍᴀɪɴʟʏ ғɪsʜᴇs. 

2⃣. ᴛʜᴇɪʀ sᴋɪɴ ɪs ᴄᴏᴠᴇʀᴇᴅ
 ᴡɪᴛʜ sᴄᴀʟᴇs.

3⃣. ᴛʜᴇʏ ʀᴇsᴘɪʀᴇ ᴡɪᴛʜ ᴛʜᴇ ʜᴇʟᴘ ᴏғ 
ɢɪʟʟs.

4⃣. ᴛʜᴇʏ ʜᴀᴠᴇ ᴛᴡᴏ ᴄʜᴀᴍʙᴇʀᴇᴅ ʜᴇᴀʀᴛ 
ᴀɴᴅ sɪɴɢʟᴇ ᴄɪʀᴄᴜʟᴀᴛɪᴏɴ ᴏғ ʙʟᴏᴏᴅ.
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thanks....