What is the function of the gemmule?

A gemmule is a reproductive structure found in some freshwater sponges and certain other organisms. Its primary function is to enable asexual reproduction and survival in unfavorable environmental conditions. Gemmules can remain dormant until conditions improve, at which point they can develop into new individuals, thus ensuring the continuation of the species. They typically contain a cluster of cells surrounded by a protective layer, allowing them to withstand harsh conditions.