Fossil Classification Welcome! You are encouraged to register with the site and login (for free). When you register, you support the site and your question history is saved.Although virtually any animal or plant records older than about 10,000 years old are typically termed fossils, the type of tissue and that of the external substance obviously determines whether a particular specimen is trace, derived, subfossil, or something else. virtually any animal or plant records older than about 10,000 years old are typically termed fossils, the type of tissue and that of the external substance obviously determines virtually any animal or plant record older than about 10,000 years old is typically termed a fossil, their type of tissue and that of the external substance obviously determine virtually all animal or plant records older than about 10,000 years old are typically termed fossils, their types of tissue and of the external substance obviously determines virtually any animal or plant record older than about 10,000 years old is typically termed a fossil, the type of tissue and that of the external substance of a given specimen obviously determines virtually all animal or plant records older than about 10,000 years old are typically termed fossils, the type of tissue and that of the external substance obviously determine Review Answer