Answer:
The geosphere contains the elements that make up the Earth's surface.
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According to sources, the most probable answer to this query is that the cholesterol is used by the cell membrane. Specifically, the selectively permeable membrane uses the lipid to make sure that they keep in contact.
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Answer:
I'm not sure if you meant Hematopoietic stem cells but if so, they are found in the peripheral blood and the bone marrow.
Pathogens generally invade the body, in their invasion they can duplicate and cause confusion such as hijacking your cells, thus they cause infection and disease. Some of these pathogens are spread through air, sweat, blood, excrete (urine/feces), or general human contact with anything concealing the pathogen.
B) No, many microorganisms, like those in your gut, are beneficial
As is turns out there are only about 100 different bacteria which are pathogenic. All other bacteria are completely harmless and, as this question states, some are crucial for proper human health as we exist in a symbiotic relationship with them. Bacteria in the large colon provide nutrients to us, and play an important role in the development of the immune system.