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.
35-37). Feathers are often preserved through carbonization. It is believed that the carbon residue is the result of feather degrading bacteria. An analysis of a Cretaceous aged fossil feather showing a banded color pattern from Brazil produced interesting results.arger organisms can be distorted by compression. However, good fossils of leaves and insects are often formed by compression. Insect and plant compression retain organic material. The organic matter making up the body of the organism may be altered during decay and rock formation.