Question

phylum porifera
phylum porifera includes sponges that lacks true tissues. sponges are very simple. they contain pores, where water enters the body and exits the body. these animals are sessile, meaning they move very little and sometimes not at all. they rely on flowing water to get their food, categorizing them as suspension feeders.
what does it mean to be sedentary or sessile?
to move very little or not at all
to have a skeleton of calcium particles
to quickly move through water to catch prey

Explanation:

The text states "These animals are sessile, meaning they move very little and sometimes not at all."

Answer:

to move very little or not at all