In a hydra, digestion is completed intracellularly.
Hence option (a) is correct.
Small, freshwater organisms of the phylum Cnidaria and class Hydrozoa are grouped under the genus Hydra. They are indigenous to temperate and tropical climates.
The digestion takes place intracellularly in Hydra.
Because of their ability to regenerate and the fact that they don't appear to age or experience old age, hydra have drawn the attention of biologists.
Like most other cnidarians, hydras have a pretty straightforward digestive system.
They have a two-way digestive system, which differs from mammals in that food and waste enter and exit through the same aperture. A "blind gut" is the name for this configuration.
The center of the hydra's body is occupied by its digestive tract.
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Water, Humus, air, plants, organisms , nutrients, particles (inorganic
Soil creation is a result of carrying out successions. Succession is the process in which land that is inhabitable by organisms is reclaimed and made fertile. This is done using pioneer species, which do not require soil to grow. After a while, these species are removed and a secondary succession is carried out. After this process, soil is created and the land becomes fertile.
