If there is no oxygen...many cells die....but some can perform cellular respiration without oxygen too.....they are anaerobic. they usually use organic substance to survive !!!
as acidophilic bacteria survive without oxygen in acids ...so !!!
I believe the answer is <span>The projections are trichocysts, released for the self-defense of the paramecium.
</span>Trichocysts could be easily found in the pathway of the metabolic system. Even though scientists still haven't figured out the actual significant function of trichocysts, <span> Paramecium apparently can be extruded for anchorage during feeding.</span>
For your questions it may be because of the climatic changes in your contry.(for eg people from very cold countries would likely be having more white hairs,or people from tropical countries such as India,Pakistan,Iraq etc have brown skin due to the exposure of high heat.)
