Final answer:
The biological structures used to kill prey with a meathook tip are fangs, often seen in venomous snakes and spiders.
Step-by-step explanation:
The biological structures used to kill prey with a meathook tip are fangs. Fangs are often associated with certain species of snakes and spiders, serving not only to incapacitate or kill prey but also to inject venom in some cases. For example, snake fangs are adapted to deliver venom efficiently to their prey. On the other hand, the claws of animals like big cats are also adapted for killing but do not have a meathook tip and are more associated with gripping and tearing rather than the injection of venom. Antlers, found on animals such as deer, are primarily used for fighting among males, while beaks are found in birds and can vary greatly in shape and size, but are not typically used to kill with a meathook tip like fangs.