You are given a sentence and your task is to generate another sentence that supports the given input.

Example input: In spite of this reduced heat input, the surface temperature of Venus is higher than that of the Earth.
Example output: Venus has a warmer average surface temperature than earth.
Example explanation: Output statement supports the input statement's claim about the temperatures of Venus being higher than the earth.
Q: Arandaspids represent the oldest known craniates, a proposed group of chordates that contain all chordates with a cartilage-derived skull (i.e., lampreys, armored agnathans, and gnathostomes), and hagfish.
A:
Hagfishes have a skull made of cartilage.