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.
1.1.3 Types of fossils. There are many ways in which a record of an organism can be preserved. Body fossils can occur in many ways, including: unaltered preservation, recrystallization, replacement, permineralization, carbonization, impressions, casts and internal molds..2.2 Other types of fossils. 1  1. Trace fossils. 2  Unlike body fossils, where a portion of the actual organism or its skeleton is preserved, trace fossils are the remains of an organism's activity or behavior. 3  Examples include tracks, trails, burrows, and borings. 4  Trace fossils will be covered in detail in a later lab. 5  2.
The quick answer to this question is that an animal or plant had to be very lucky to become a fossil, and even luckier to have its fossil remains discovered. Fossilization is an infrequent occurrence that is highly dependent on chance. In the past, like today, the remains of most organisms were eaten by animals, consumed by microorganisms, or weathered away. Only dead organisms that are buried in sediment quickly can escape these destructive natural processes and become fossils.