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

SOLUTION: Hagfishes have a skull made of cartilage.

PROBLEM: In selective breeding, organisms with desirable characteristics are mated to produce offspring with the same characteristics.

SOLUTION: Selective breeding involves choosing certain organisms to reproduce with one another in order to pass on specific, desirable traits to their offspring.

PROBLEM: A heterotroph is an animal that can't make its own food supply, so they have to eat other things, like plants or other animals, to survive.

SOLUTION:
Animals can not produce their own food making them heterotrophs