Question

state the reason why most of terrestrial animal fertilization take place internally

Answer 1

it is so because the animal's gamete can swim to each other and can fuse together in water . But in land animals the gametes will need a locomotary organ with which it'll be able to move.. which the gametes dont posses.. thus the fertilization takes place internally

Answer 2

ʙᴇᴄᴀᴜꜱᴇ ᴛʜᴇ ᴀɴɪᴍᴀʟ ɢᴀᴍᴇᴛꜱ ᴄᴀɴ ꜱᴡɪɴ ɪɴ ᴡᴀᴛᴇʀ ᴀɴᴅ ꜰᴜꜱᴇ ᴡɪᴛʜ ᴇᴀᴄʜ ᴏᴛʜᴇʀ