Kelp does have a long stem, like our crinoid. But kelp are actually plants. They need to live near the surface of the water so that they can be in sunlight and grow. And Kelp can grow much larger than crinoids—some varieties can grow taller than 200 feet!

Try again! Which of these modern species does the crinoid fossil look most like?

© The Children's Museum of Indianapolis, 2000