Most freshwater hydrozoa exist only as the polyp form. They never switch to the medusa form, or sexual form. This means they exist only in the asexual form.
no
In the phylum cnideria there are three classes. They are hydrozoa, scyphozoa, and anthozoa. In the class hydrozoa, their habitats are fresh and marine water. In scyphozoa, their habitats are marine only. In anthozoa, their habitats are marine only.
A genus of small, freshwater cnidarians (coelenterates) which belong to the class Hydrozoa. Hydra is an exceptional member of this class because it is a mobile individual polyp rather than a sessile or colonial form, and uses its cnidoblasts to capture prey. Unlike most Hydrozoa, which spend at least part of their lives in a medusa form, which reproduces sexually, Hydra exists only as polyps. They are typically a few millimeters long.
Yes. Platypuses can only live in freshwater ecosystems.
Melting is the only threat to the freshwater ice sheet.
Because saltwater fish can only breathe in saltwater (as in the ocean) and freshwater fish can only breathe in freshwater (as in tap water.)
The question needs to be refined, as there are hundreds of freshwater fish species.
Only freshwater
The majority of the Earth's water is saltwater found in oceans. Only a small percentage, about 2.5%, is freshwater. However, much of this freshwater is frozen in ice caps and glaciers, or stored underground in aquifers, making only a small percentage of freshwater readily available for human use.
Most of Earth's freshwater is stored in glaciers and ice caps, particularly in Antarctica and Greenland, accounting for about 68.7% of the total freshwater supply. The remainder is found in groundwater (approximately 30.1%), with only a small fraction (about 1.2%) existing in lakes, rivers, and the atmosphere. This distribution highlights the limited availability of easily accessible freshwater resources for human use and ecological needs.
Along the Nile River because they needed a source of water and that was there only freshwater source.
Of all the water on earth, , only 2.59% is avalible as freshwater