Question

how many animals heart​

Answer 1

This is called a four-chambered heart. Other mammals and birds all have four-chambered hearts. Other animal groups, such as reptiles, amphibians, fish, and insects, have hearts that look a little different (Figure 1). Figure 2 - Hearts have adapted differently to best suit every animal.

Answer 2

Answer:

ᴛʜɪs ɪs ᴄᴀʟʟᴇᴅ ᴀ ғᴏᴜʀ-ᴄʜᴀᴍʙᴇʀᴇᴅ ʜᴇᴀʀᴛ. ᴏᴛʜᴇʀ ᴍᴀᴍᴍᴀʟs ᴀɴᴅ ʙɪʀᴅs ᴀʟʟ ʜᴀᴠᴇ ғᴏᴜʀ-ᴄʜᴀᴍʙᴇʀᴇᴅ ʜᴇᴀʀᴛs. ᴏᴛʜᴇʀ ᴀɴɪᴍᴀʟ ɢʀᴏᴜᴘs, sᴜᴄʜ ᴀs ʀᴇᴘᴛɪʟᴇs, ᴀᴍᴘʜɪʙɪᴀɴs, ғɪsʜ, ᴀɴᴅ ɪɴsᴇᴄᴛs, ʜᴀᴠᴇ ʜᴇᴀʀᴛs ᴛʜᴀᴛ ʟᴏᴏᴋ ᴀ ʟɪᴛᴛʟᴇ ᴅɪғғᴇʀᴇɴᴛ