Turtles are ancient reptiles with unique shells, found worldwide except Antarctica. They are classified into true turtles, tortoises, and terrapins, each with distinct adaptations. Turtles have evolved various physiological traits, including a shell formed from their skeleton. They exhibit specific behaviors, relying on senses like smell and limited hearing. Turtles reproduce through courtship rituals, with females laying eggs in nests. They have long lifespans, with some species living over 200 years, and do not age traditionally, maintaining organ function until death.

Explain the significance of the turtle's shell in its anatomy.

How do hatchlings of turtles behave immediately after birth?

What is the typical lifespan of turtles and what factors influence it?