Yes.
no. hydras (the multicelluar organism) are generally a few millimeters long and are best seen under a microscope. because of that, one would have no idea if they were alive or dead, and they feed on microscopic organisms as well.
The hydras are gone.
there is not even hydras on clubpenguin
Hydras do not have a skeleton. They are multicellular organisms that belong to the phylum Cnidaria and are characterized by a simple body structure without bones or hard structures. Hydras have a flexible body made up of a layer of cells surrounding a central digestive cavity.
hydras have testes to produce and release sperm and ovaries to produce and release eggs
The kingdom is animalia.
They are gone.
hydras carry out asexual reproduction (binary fission) whereas mammals carry out sexual reproduction (mating)
invertibrates
hydras.
Cnidarians
Hydras are acoelomates.