This question is asking for a possible explanation for the given correct answer, which is "tusk, tail, trunk." The explanation could be that these are all physical features of an elephant. Elephants have tusks, which are long, curved teeth that protrude from their mouths. They also have a tail, which is a long, thin appendage at the end of their bodies. Lastly, elephants have a trunk, which is a long, flexible nose-like organ that they use for various tasks such as eating, drinking, and communication.