As a result of immunodeficiency, most infected cats do not show symptoms and have normal life expectancy, however they are prone to developing other infections and certain types of cancer. A retrovirus, such as FIV, inserts a copy of its genetic material into the DNA of a host cell, where it can replicate. FIV is a lentivirus. a specific type of retrovirus that can take months, or even years to incubate, so the virus is slow moving, capable of lying dormant in the body before causing symptoms.
A fossil is the remains or traces of a once-living plant or animal that was preserved in rock or other material before the beginning of recorded history.The term also is used to describe the fossil fuels (oil, coal, petroleum, and natural gas) that have been formed from the remains of ancient plants and animals.nother type of fossil is the darkened carbon imprint of a buried plant or, more rare, animal. When an organism dies and is buried, pressure underneath Earth's surface compresses the organism between rock faces.
Mold fossils are fossil impressions left after the animal or plant decomposes. They are negative images and often formed by the animal being left in acidic groundwater. Silt deposits form over the animal or plants impression after the shells or organic matter dissolves. An imprint is left. This void is called a mold.rue-form fossils are body parts of an animal or remains of a substance. They are often formed when the organism is caught in ice, tree sap or tar. Complete features are left behind.