Renal agenesis. Renal agenesis is a medical condition in which one (unilateral) or both (bilateral) fetal kidneys fail to develop.
Polycrystalline cells are composed of multiple silicon crystals, which is a cheaper way to manufacture solar modules. Put simply, these cells are easier for a factory to produce, so they are less expensive. Polycrystalline cells are made by several methods, but most commonly with a cast of molten silicon.
Details. Poly sheeting is a generic term also often referred to as construction and agricultural film or Visqueen. Poly sheeting is made from Low-density polyethylene and is most often offered in clear or black. Poly sheeting is often used as a vapor barrier or drop cloth.