Question

external fertilization is not seen ?​

Answer 1

ʜɪɪ ᴍᴀᴛᴇ ʜᴇʀᴇ's ᴜʀ ᴀɴsᴡᴇʀ

sᴇxᴜᴀʟ sᴇʟᴇᴄᴛɪᴏɴ ᴍᴀʏ ɴᴏᴛ sᴇᴇᴍ ᴛᴏ ᴏᴄᴄᴜʀ ᴅᴜʀɪɴɢ ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ, ʙᴜᴛ ᴛʜᴇʀᴇ ᴀʀᴇ ᴡᴀʏs ɪᴛ ᴀᴄᴛᴜᴀʟʟʏ ᴄᴀɴ. ᴛʜᴇ ᴛᴡᴏ ᴛʏᴘᴇs ᴏғ ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴇʀs ᴀʀᴇ ɴᴇsᴛ ʙᴜɪʟᴅᴇʀs ᴀɴᴅ ʙʀᴏᴀᴅᴄᴀsᴛ sᴘᴀᴡɴᴇʀs. ғᴏʀ ғᴇᴍᴀʟᴇ ɴᴇsᴛ ʙᴜɪʟᴅᴇʀs, ᴛʜᴇ ᴍᴀɪɴ ᴄʜᴏɪᴄᴇ ɪs ᴛʜᴇ ʟᴏᴄᴀᴛɪᴏɴ ᴏғ ᴡʜᴇʀᴇ ᴛᴏ ʟᴀʏ ʜᴇʀ ᴇɢɢs.

ᴍᴀɴʏ ғɪsʜ, ᴀᴍᴘʜɪʙɪᴀɴs, ᴀɴᴅ ᴏᴛʜᴇʀ sᴇxᴜᴀʟ ᴀϙᴜᴀᴛɪᴄ ᴀɴɪᴍᴀʟs ᴜsᴇ ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ (ᴛʜᴇ ᴇxᴄᴇᴘᴛɪᴏɴs ᴀʀᴇ ᴀϙᴜᴀᴛɪᴄ ᴍᴀᴍᴍᴀʟs, sʜᴀʀᴋs, ᴀɴᴅ sᴏᴍᴇ ᴏᴛʜᴇʀ sᴘᴇᴄɪᴀʟ ᴛʏᴘᴇs ᴏғ ғɪsʜ). ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ ɪs ʙᴇɴᴇғɪᴄɪᴀʟ ʙᴇᴄᴀᴜsᴇ ᴛʜᴇ ᴍᴏᴛʜᴇʀ ᴅᴏᴇs ɴᴏᴛ ʜᴀᴠᴇ ᴛᴏ ᴘʜʏsɪᴄᴀʟʟʏ ᴄᴀʀʀʏ ᴛʜᴇ ᴅᴇᴠᴇʟᴏᴘɪɴɢ ᴏғғsᴘʀɪɴɢ.

ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ ᴜsᴜᴀʟʟʏ ᴏᴄᴄᴜʀs ɪɴ ᴀϙᴜᴀᴛɪᴄ ᴇɴᴠɪʀᴏɴᴍᴇɴᴛs ᴡʜᴇʀᴇ ʙᴏᴛʜ ᴇɢɢs ᴀɴᴅ sᴘᴇʀᴍ ᴀʀᴇ ʀᴇʟᴇᴀsᴇᴅ ɪɴᴛᴏ ᴛʜᴇ ᴡᴀᴛᴇʀ. ... ᴍᴏsᴛ ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ ʜᴀᴘᴘᴇɴs ᴅᴜʀɪɴɢ ᴛʜᴇ ᴘʀᴏᴄᴇss ᴏғ sᴘᴀᴡɴɪɴɢ ᴡʜᴇʀᴇ ᴏɴᴇ ᴏʀ sᴇᴠᴇʀᴀʟ ғᴇᴍᴀʟᴇs ʀᴇʟᴇᴀsᴇ ᴛʜᴇɪʀ ᴇɢɢs ᴀɴᴅ ᴛʜᴇ ᴍᴀʟᴇ(s) ʀᴇʟᴇᴀsᴇ sᴘᴇʀᴍ ɪɴ ᴛʜᴇ sᴀᴍᴇ ᴀʀᴇᴀ, ᴀᴛ ᴛʜᴇ sᴀᴍᴇ ᴛɪᴍᴇ.

sᴇxᴜᴀʟ ʀᴇᴘʀᴏᴅᴜᴄᴛɪᴏɴ sᴛᴀʀᴛs ᴡɪᴛʜ ᴛʜᴇ ᴄᴏᴍʙɪɴᴀᴛɪᴏɴ ᴏғ ᴀ sᴘᴇʀᴍ ᴀɴᴅ ᴀɴ ᴇɢɢ ɪɴ ᴀ ᴘʀᴏᴄᴇss ᴄᴀʟʟᴇᴅ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ. ᴛʜɪs ᴄᴀɴ ᴏᴄᴄᴜʀ ᴇɪᴛʜᴇʀ ɪɴsɪᴅᴇ (ɪɴᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ) ᴏʀ ᴏᴜᴛsɪᴅᴇ ( ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ) ᴛʜᴇ ʙᴏᴅʏ ᴏғ ᴛʜᴇ ғᴇᴍᴀʟᴇ. ʜᴜᴍᴀɴs ᴘʀᴏᴠɪᴅᴇ ᴀɴ ᴇxᴀᴍᴘʟᴇ ᴏғ ᴛʜᴇ ғᴏʀᴍᴇʀ ᴡʜᴇʀᴇᴀs sᴇᴀʜᴏʀsᴇ ʀᴇᴘʀᴏᴅᴜᴄᴛɪᴏɴ ɪs ᴀɴ ᴇxᴀᴍᴘʟᴇ ᴏғ ᴛʜᴇ ʟᴀᴛᴛᴇʀ.

ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ᴜ..!!...

ᴘʟᴢᴢᴢ ᴍᴀʀᴋ ᴀs ʙʀᴀɪɴʟɪᴇsᴛ...!!..

Answer 2

Explanation:

$\huge\mathtt\red{Answer}$

The fusion of competence and outside the body of an organism is called external fertilization .

Ex:- Frog.