In this marine science worksheet, students complete a crossword puzzle with 32 questions on sponges and cnidarian. They identify the different characteristics of sponges and cnidarian.

In this simple animals worksheet, students read information about sponges, cnidarians, flatworms, and roundworms and then complete a chart comparing and contrasting these groups of animals. This worksheet has 11 fill in the blank questions.

In this invertebrates activity, students read about the characteristics of the different groups of invertebrates. Then students complete 10 multiple choice questions.