WONDER #1250: How Are Sea Shells Formed?

Question 1 of 3

<p class=\"FreeForm\">Sea shells are the former homes of which invertebrates?</p>

1. mollusks
2. badgers
3. starfish
4. dolphins

Question 2 of 3

<p class=\"FreeForm\">The outer layer of a mollusk’s shell usually contains a material similar to a human being’s what?</p>

1. eyelashes
2. nose
3. fingernails
4. liver

Question 3 of 3

<p class=\"FreeForm\">Which element is a primary material in most sea shells?</p>

1. oxygen
2. hydrogen
3. calcium
4. ozone

Check your answers online at https://www.wonderopolis.org/wonder/How-Are-Sea-Shells-Formed.