Other causes of prostate enlargement include prostate cancer and prostate infection (prostatitis). Causes of blockage of the urethra that can occur in both sexes include scar tissue, injury (as in a car wreck or bad fall), blood clots, infection, tumors in the pelvic region, and stones (rare).
Cast Fossils: an imprint that is filled in, then fossilized Permineralization: process in which an organism dies and sediment enters the body, filling in the pores of a leaf, or a bone or a shell Whole Body Preservation: occurs when the total organism is fossilized; may occur through freezing or falling in tree amber
Fossils also form from molds and casts. If an organism completely dissolves in sedimentary rock, it can leave an impression of its exterior in the rock, called an external mold. If that mold gets filled with other minerals, it becomes a cast. An internal mold forms when sediments or minerals fill the internal cavity, such as a shell or skull, of an organism, and the remains dissolve. Organic remnants. In recent years, researchers have discovered that some fossils aren't just made of minerals.