(c) The correct answer for this option is ulcers.
Helicobacter pylori is caused by H.Pylori bacteria which infect your stomach. The spiral shape of H. pylori allows it to penetrate the stomach lining, where it’s protected by mucus and the body’s immune cells can’t reach it.
Helicobacter pylori infection infect the stomach lining and may lead to ulcers (sore on the lining of the stomach (gastric ulcer) or the first part of the small intestine (duodenal ulcer) in stomach and small intestine.
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Specific excretory organs are absent in unicellular organisms belonging to the<u> phylum Porifera.</u>
The organisms of the phylum Porifera are classified under the kingdom Animalia and they lack specific organs in their bodies.
The word "Porifera" refers to pore-bearing organisms.
These animals have loosely organized cells and are found in freshwater marine ecosystems.
On their body, a large number of pores - Ostia - are present which perform various functions such as excretion.
However, respiratory gases and waste materials are exchanged through a diffusion process.
Moreover, in them, reproduction takes place through fragmentation and budding.
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