This answer is unlimited. All sponges are different sizes, and each species has variations on the number of pores. Sponges are only made of spongin, a network of webbed collagen. Pores are only gaps in the spongin where water is forced through. As you may already know, squeezing a sponge expels the water from all locations of the sponge. Therefore, water can travel through all parts of the sponge. You may consider every gap in the spongin to be a pore. This number cannot be recorded, as it varies greatly throughout all sponges.
Pores
The body of a sponge is covered in tiny openings called pores. These pores allow water to flow in and out of the sponge, which helps the sponge filter out food particles and oxygen from the surrounding water.
Sponges have pores and are filter feeders
a sea sponge uses energy when mating and filtering food :)
flagella
No, it has pores which allow the sponge to filter feed.
ostium ostia
through its pores and holes
The sponge absorption process works by soaking up liquid through tiny pores in the sponge material. Factors that affect the efficiency of sponge absorption include the material of the sponge, the size of the pores, the density of the sponge, and the surface area of the sponge.
"clean" water and "waste" water in a sponge are all the same. Their bodies allow constant flow of water, there is no beginning and end to a sponge; thus technically waste water leaves a sponges body through its many pores.
a kitchen sponge sea spone purple sponge (sea sponge)
Oh that's quite simple. Find a sponge and get a bowl. Put the sponge in the water and explain how the pores in the sponge suck in the water as you put pressure on it. As you squeeze it explain that the pores release the water through them.