Question

Be able to state 3 characteristics that distinguish sponges from other invertebrate. Be able to describe their sac-like body shape, why they are called filter feeder, and the meaning of the word sessile.

Answer 1

Sponges have a sac-like body shape and are filter feeders. They are sessile, meaning they cannot move and are attached to a surface.

Step-by-step explanation:

Sponges: Characteristics and Feeding Mechanism

-Sac-like body shape:

Sponges have a tube-like body shape with many tiny pores. They lack true tissues and organs, and their bodies are made up of specialized cells that perform specific functions.
- Filter feeders:

Sponges are called filter feeders because they obtain their food by filtering water. Water flows through the sponge, and specialized collar cells called choanocytes filter out food particles such as bacteria with their tiny hairs.
- Meaning of the word sessile:

Sessile means stationary or immobile. Adult sponges are sessile because they cannot move and remain attached to a surface in their environment.