Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

The eggshell is made of
calcium . The white, or
, is composed by , a
protein. The is predominantly
constituted lipids but it contains
proteins and .