They do. They reproduce in three ways:
Sexual Reproduction: Sponges are sessile, which means that they cannot move. Instead of making physical contact, one sea sponge will act as a male and release its sperm into the water. Then another sponge (female) either a meter away or a mile away will absorb the sperm and use it to fertilize itself. The baby sponge will become a free swimming larva, the only time it can swim/move. It will find a plankton rich area to settle down in and grow as a sponge there.
Asexual Reproduction: This is the easier way. A sponge loses a chunk of itself and it grows into a new sponge. This new sponge skips the larva stage and is a 'young sponge' at birth.
Internal Fertilization: A sponge create both the egg and the sperm, thus fertilizing itself.
Note: Some sponges can chose if they want to be male or female, and others can't. Also, some sponges are both male and female.
A video I have found helpful in my research, can be found in the related link
Bacteria and sponge reproduce asexually,.......meaning they do not reproduce through sex.......
Sponges can reproduce sexually or asexually
a kitchen sponge sea spone purple sponge (sea sponge)
regeneration
All bacteria grow and reproduce
He is a sea sponge. His appearance makes him appear as a kitchen sponge, yet Sea sponges do not look like this.a sponge.
Bacteria can reproduce extremely quickly if in the right environment. Under favorable conditions, a single bacteria can reproduce 108 bacteria in twelve hours.
it is more likelly for bacteria to reproduce asexually. it is very rare for bacteria to reproduce sexually. but it is possible
There are 6 different types of sea sponges, the tube sponge, vase sponge, yellow sponge, bright red tree sponge, painted tunicate sponge, and the sea squirt sponge.
Sea sponge
a sponge that lives in the sea
He is a sea sponge.
Sea Sponges naturally inhibit the growth of bacteria. Wash the sponge with a mild soap and rinse thoroughly. Dissolve 1 Tbsp. baking soda in one cup of warm water and soak the sponge in this solution for one hour. Rinse thoroughly and allow to air dry.