Answer:Jun 12, 2014 - A reservoir of water three times the volume of all the oceans has been discovered deep beneath the Earth's surface. The finding could help ...
Explanation:
The human immunodeficiency virus (HIV) that causes the disease known as aids selectively infects helper T cells (CD4+).
This retrovirus also infects macrophages and dendritic cells. When CD4+ T cell numbers decrease below a critical level (due to the killing of this cells with different mechanisms), cell-mediated immunity is lost. As a result, the body becomes progressively more susceptible to infections, leading to the development of AIDS.
<span> HIV can be transmitted only via body fluids like blood, semen, pre-seminal fluid, rectal fluids, vaginal fluids, and breast milk, which means that people usually get or transmit HIV through sexual behaviours and use of the needle. For HIV infection, these fluids must come in direct contact with a mucous membrane or damaged tissue. Another way is to be directly injected into the bloodstream (from a needle for example).</span>
The stem of a plant grows_________from the pith. <u>outwards</u> or inwards
Centi represents the smallest value
the <em>sun's corona</em> is only visable when there is a solar eclipse
