Hydrozoa there is the life soliter ( apart) and there is of colony ( team). Hydrozoa which soliter have form of adenoid, while which colony with form of dominant adenoid and some types form medusa. Example Of Hydra and Obellia.
1. Hydra
Form of body Hydra like adenoid, live in freshwater. Body measure Hydra between 10 mm – 30 mm. The food in the form of small plant and Crustacea is low. Part of body side under lockup form foot/feet, the usage for sticking at object and make a move. At the end of which at the oposite there are mouth encircled by hypostome and in around his(its there are 6 – 10 fruit of tentacle. Tentacle function as a means of catch food. Hereinafter food is ingested in cavity gastrovaskuler.
Growth Of Hydra happened asexually and sexual. Propagation asexually happened through forming of tunas/budding, about at part of middle side of body wall Hydra. Bydm soriyt have owned epidermis, mesoglea and cavity gastrovaskuler. The bydm soriyt continue is big and finally secede from the mains body is to be individual is new.
Propagation sexually happened through egg fusion cell ( from ovary) with sperm ( from testis). Result of forge of forming zygote which will grow until gastrula stadium. Then this embryo will grow to form cyst with wall from horn matter. This cyst can swim Free and in place appropriate will stick at object in water territory base. Then if(when situation of good environment, core of emergence embryo and split up cyst become Hydra is new.
