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!

These beings present and
endoderm, two layers. Animals
with two germ layers called
diploblastic animals.

ectoderm gives birth the
epidermis and endoderm originates
the of the digestive .