Answer:
Small and tube shaped, water enters the sponge through dermal pores and flows into the atrium. Choanocyte flagella create the current to expel it through a single osculum. Note that water enters the sponge through a modified cell known as a porocyte.
Explanation:
Hope this helped, Have a Wonderful Day!!
1 is the answer because it’s talking about chemical
A large base with flexible structure would be best. The base would hold up, and the flexible structure would prevent falling.