ᴅᴇꜱᴄʀɪʙᴇ ᴛʜᴇ ᴇᴠᴏʟᴜᴛɪᴏɴᴀʀʏ ᴄʜᴀɴɢᴇ ɪɴ ᴛʜᴇ ᴘᴀᴛᴛᴇʀɴ ᴏꜰ ʜᴇᴀʀᴛ ᴀᴍᴏɴɢ ᴛʜᴇ ᴠᴇʀᴛᴇʙʀᴀᴛᴇꜱ.
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Answer:
ᴠᴇʀᴛᴇʙʀᴀᴛᴇꜱ ʜᴀᴠᴇ ᴀ ꜱɪɴɢʟᴇ ʜᴇᴀʀᴛ. ɪᴛ ɪꜱ ᴀ ʜᴏʟʟᴏᴡ, ᴍᴜꜱᴄᴜʟᴀʀ ᴏʀɢᴀɴ ᴄᴏᴍᴘᴏꜱᴇᴅ ᴏꜰ ᴄᴀʀᴅɪᴀᴄ ᴍᴜꜱᴄʟᴇ ꜰɪʙʀᴇꜱ. ᴛᴡᴏ ᴛʏᴘᴇꜱ ᴏꜰ ᴄʜᴀᴍʙᴇʀꜱ ɪɴ ʜᴇᴀʀᴛ ᴀʀᴇ ᴀᴛʀɪᴀ ᴀɴᴅ ᴠᴇɴᴛʀɪᴄʟᴇꜱ. ᴛʜᴇ ʜᴇᴀʀᴛ ᴏꜰ ʟᴏᴡᴇʀ ᴠᴇʀᴛᴇʙʀᴀᴛᴇꜱ ʜᴀᴠᴇ ᴀᴅᴅɪᴛɪᴏɴᴀʟ ᴄʜᴀᴍʙᴇʀꜱ, ɴᴀᴍᴇʟʏ ꜱɪɴᴜꜱ ᴠᴇɴᴏꜱᴜꜱ ᴀɴᴅ ᴄᴏɴᴜꜱ ᴀʀᴛᴇʀɪᴏꜱᴜꜱ ᴏʀ ʙᴜʟʙᴜꜱ ᴀʀᴛᴇʀɪᴏꜱᴜꜱ ᴏʀ ᴛʀᴜɴᴄᴜꜱ ᴀʀᴛᴇʀɪᴏꜱᴜꜱ. ᴅᴜʀɪɴɢ ᴛʜᴇ ᴄᴏᴜʀꜱᴇ ᴏꜰ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ, ɪɴ ʜɪɢʜᴇʀ ᴠᴇʀᴛᴇʙʀᴀᴛᴇꜱ, ᴛʜᴇ ᴘᴇʀꜱɪꜱᴛᴇɴᴛ ᴘᴏʀᴛɪᴏɴꜱ ᴠɪᴢ, ᴀᴜʀɪᴄʟᴇꜱ ᴀɴᴅ ᴠᴇɴᴛʀɪᴄʟᴇꜱ ᴀʀᴇ ʀᴇᴛᴀɪɴᴇᴅ. ʜᴏᴡᴇᴠᴇʀ, ᴛʜᴇꜱᴇ ɢᴇᴛ ᴄᴏᴍᴘʟɪᴄᴀᴛᴇᴅ ʙʏ ɪɴᴄᴏʀᴘᴏʀᴀᴛɪɴɢ ꜱᴇᴠᴇʀᴀʟ ᴠᴀʟᴠᴇꜱ ɪɴꜱɪᴅᴇ ᴛʜᴇᴍ ᴀɴᴅ ʙᴇᴄᴏᴍɪɴɢ ᴄᴏᴍᴘᴀʀᴛᴍᴇɴᴛᴀʟɪ ꜱᴇᴅ.
Ur answer...Hope it helps u sister vaise ye mela hi question h ..xD
Answer:
All vertebrates possess a muscular chambered heart. (i) Fishes have a two-chambered heart with an atrium and a ventricle. The heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart.
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