What is a venom?

Venom is defined as a specialized type of toxin that is actively injected by an organism through a bite or sting. This mechanism is particularly common among certain species like snakes, spiders, and jellyfish, which use venom as a means for predation or defense. The distinction between venom and other forms of toxins is important; venom must be delivered through a specialized structure (like fangs or stingers), whereas toxins can be passively harmful. Therefore, the first option accurately describes the nature of venom as a poison transmitted in a direct manner, setting it apart from other hazardous substances that might be ingested or encountered indirectly. The other choices refer to different kinds of toxic substances or allergic reactions, which do not encapsulate the specific mechanism and function associated with venom.