Life History
At first glance, sea urchins often appear sessile, i.e. incapable of moving. Sometimes, the most visible life sign is the spines, which attach to ball-and-socket joints and can point in any direction. In most urchins, touch elicits a prompt reaction from the spines, which converge toward the touch point. Sea urchins have no visible eyes, legs, or means of propulsion, but can move freely over hard surfaces using adhesive tube feet, working in conjunction with the spines.
Read more about this topic: Sea Urchin
Famous quotes containing the words life history, life and/or history:
“The extrovert and introvert, the realist and idealist, the scientist and philosopher, the man who found himself by refinding his life history and the individual who discovered his being in fantasy, these are the differences between Freud and Jung.”
—Robert S. Steele. Freud and Jung: Conflicts of Interpretation, ch. 10, Routledge & Kegan Paul (1982)
“There are more truths in twenty-four hours of a man’s life than in all the philosophies.”
—Raoul Vaneigem (b. 1934)
“False history gets made all day, any day,
the truth of the new is never on the news
False history gets written every day
...
the lesbian archaeologist watches herself
sifting her own life out from the shards she’s piecing,
asking the clay all questions but her own.”
—Adrienne Rich (b. 1929)