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.
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.