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

Input: Consider Input: 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.

Output: Hagfishes have a skull made of cartilage.

Input: Consider Input: The structural and functional aspects of the human body starting at the level of the cell and continuing to tissues, organs, and organ systems.

Output: The sequence cell tissue organ organ system identifies the levels of organization of body structures in a human from simplest to most complex.

Input: Consider Input: The heart becomes the first working organ in the human body, pumping by rhythmically opening and squeezing shut just 17 days after conception.
Output: In humans, the heart is the first organ to form and become functional.