Echinoderms!

Last week we learned about mollusks- bivalves and univalves. This week we explored Echinoderms- starfish, sea urchins, and sand dollars. We came up with a list of questions about these animals that we want to investigate further. Here are some of our many great questions:

How do sand dollars move?

Why do sea urchins have spikes?

How does a starfish grow its arm back?

Why do sand dollars have flower designs on them?

How do sand dollars eat?

What kind of predators might eat sea urchins?

What are the different kinds of starfish? 

What do starfish eat?

Why do some sea urchins have no spikes? 

Is there a difference between warm water and cold water sear urchins?

And many more! We also looked at different types of sand, and we sorted them into a section of sand that is "coarse" and sand that is "fine." Ask your child what the difference is!