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| What characteristic that is shared by all animals is shown in the following sentance- Sponges filter microscopic organisms from the water for food. |
| What characteristic that is shared by all animals is shown in the following sentance- enzymes are secreted in an earthworm's digestive tract. |
| What is the job of collar cells? |
| What is the job of the flagellum (flagella)? |
| What is the function of the spicules in sponges? |
| What is the function of pores in sponges? |
| Define spongin |