Aquifer
Explanation:
An aquifer is an earth material that is capable of storing ground water.
Aquifers are porous and permeable formations that stores ground water.
The two main criteria for a body to store ground water is porosity and permeability.
- Porosity is the volume of void spaces to the rock volume.
- Permeability is the inter-connectivity of the void spaces in rocks that allow its to transmit fluids.
Ground water is water that is stored in the subsurface.
These water are collected in aquifers. Most aquifers are rich in sandy materials.
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<span>The first stage of HIV infection is known as the acute stage. The body responds by producing HIV antibodies and killer T- cells which are special lymphocytes that seek out and destroy invading pathogens such as viruses and bacteria. Two to four weeks after infection, the immune system launches an attack against HIV using these antibodies and killer T-cells, significantly reducing HIV level on blood. A percentage of the viruses however escapes this onslaught by hiding in other cells and continue to multiply.</span>
The correct answer is D. Ukraine - pysanky is an Ukrainian word. It is also produced in Poland where it is called pisanki (it's the same word, but since Ukrainian is written in Cyrillic, the transliteration is different).
The lipid components of cellular membranes often include phospholipids and cholesterol. Phospholipids is made up of glycerol, fatty acids, phosphate and organic derivatives such phospho inositol and choline. Cholesterol is the component of the membrane lipid which determine the fluidity of the memebrane; it also participates in membrane singalling system.