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.
Not many plants and animals are lucky enough be turned into fossils. When an animal or plant dies its remains usually rot away to nothing. Sometimes though, when the conditions are just right and its remains can be buried quickly, it may be fossilised. There are several different ways fossils are formed.Here we go through the five steps of fossilisation to make a typical 'mould and cast' fossil. An animal dies, its skeleton settles on the sea floor and is buried by sediment. An animal dies and its body sinks to the sea floor.ometimes though, when the conditions are just right and its remains can be buried quickly, it may be fossilised. There are several different ways fossils are formed. Here we go through the five steps of fossilisation to make a typical 'mould and cast' fossil.
Its soft parts often decay quickly or are eaten by animals. That is why typically only the hard parts of a plant or an animal leave fossils. These hard parts include bones, teeth, shells, seeds, or woody stems. It is rare for the soft parts of an organism to become a fossil.