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.
Burial. Animals that live in or near water have the best chance of becoming fossils. They sink to the sea bed and the remains are covered with sediment, protecting them from predation.Other animals may have been buried by sandstorms or even volcanic eruptions.mage by Flickr.com, courtesy of woodley wonderworks. The process of fossilization replaces organic matter with minerals. These minerals seep into the object, harden and become fossil stone, a copy of that object that has the chemical properties of a rock.