Examlex
At 3 to 4 years of age, the coronal aspect of the root begins to resorb and continues apically until the tooth is shed. The process of shedding the deciduous dentition and replacement by permanent successors is called exfoliation.
Extinctions
The end of an organism or group of organisms, typically a species, resulting in its disappearance from the Earth.
Turnovers
Events in ecological or evolutionary contexts where one species or group of species is replaced by another in a habitat, often due to environmental changes.
Cambrian Period
A geological era approximately 541 million years ago, marked by a rapid diversification of life forms and the appearance of many major groups of animals.
Evolutionary Faunas
Groups of animals that share a common evolutionary history and are identified in the fossil record over large geographical areas and timelines.
Q1: How many surfaces does a posterior tooth
Q3: The action of the orbicularis oris is
Q7: The genioglossus pair of muscles aids in
Q8: The dental sac is composed of several
Q11: A fourth molar may be described by
Q16: The buccal gingiva of the posterior maxillary
Q22: In figure "C" below, identify the tooth,
Q22: Each of the following may be present
Q23: The periodontal ligament provides a hammock of
Q23: A patient has porcelain crowns on #3