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.
Fossils are most often preserved within sediments that were deposited in water, such as wetlands, river basins, or the ocean. Permineralization or Petrification-After an organism is buried, minerals carried by water such as silica, calcite or pyrite replace the organic material in the fossil.he oldest fossils in the fossil record date from 3.5 billion years ago, however it wasn't until around 600 million years ago that complex, multi-cellular life began was first preserved in the fossil record. There are two main types of fossils; body and trace.