its because the gemmules are like the little packages that hold the start of another sponge, so even if the sponge doesnt survive, the gemmule will, and then when conditions get better the gemmule will make another sponge.
Of the choices choanocytes, medusa, spicules, or gemmules, Medusa is the option that is not associated with sponges.
Sea sponges have no courtship. Most can't even move to new locations. They reproduce by either budding or produce gemmules (replications of themselves that are like "time-release" capsules).
Oh, dude, let me break it down for you. So, gemmules are like these little sponge babies that can survive tough conditions, but larvae are like the cool kids who can swim around and find new homes. So, if you want your sponge population to spread far and wide, larvae are the way to go. Gemmules are more like the backup plan for when things get rough.
Spongilla is a genus of freshwater sponge in the family Spongillidae. They are found in lakes and slow streams. Sponges of the genus Spongilla attach themselves to rocks and logs and filter the water for various small aquatic organisms such as protozoa, bacteria, and other free-floating pond life. Unlike marine sponges, fresh-water sponges are exposed to far more adverse and variable environmental conditions, and therefore they have developed gemmules as a means of dormancy. When exposed to excessively cold or otherwise harsh situations, the sponges form these gemmules, which are highly resistant "buds" that can live dormantly after the mother sponge has died. When conditions improve, the gemmules will "germinate" and a new sponge is born.
Sponges can reproduce sexually or asexually. They can reproduce through producing eggs and sperm that are released into the water where they can combine to form larvae. Asexual reproduction can occur through budding, fragmentation, or producing gemmules.
A dormant mass of amoebocytes surrounded by protective layers of spicules is known as a gemmule. Gemmules are a form of asexual reproduction in sponges and can survive harsh environmental conditions until they are ready to develop into a new sponge.
gemmules
Sporophyte
starfish sponges sea cucumber others
The buds formed inside a sponge during asexual reproduction are called gemmules. These structures contain a cluster of cells surrounded by a protective layer and can detach from the sponge to form a new individual under favorable conditions.
Sponges do not give birth. The only animals who give birth to live young are mammals. Sponges reproduce by releasing sperm or eggs into the sea. The sperm and eggs just mix up in the water and form tiny sponges. The "babies" float around until they land, where they grow into new sponges. Some sponges can also form a "bud" that grows into a new sponge without any sex involved.
Both humans and sponges are made of millions of cells, both need oxygen to survive, both need water and both produce waste products.