To be a useful index fossil, a species must have been rare. true or false

The given statement is False

Index fossils are the fossils that is used as guide or indicator to identify the geologic periods. Index fossils must have a short vertical range and wide geographic distribution and should have evolutionary trends.This fossil need not to be rare to be called as index fossil.

Example: Calico scallop, Scaphites, Inoceramus, Leptodus.

The given statement is False

Index fossils are the fossils that is used as guide or indicator to identify the geologic periods. Index fossils must have a short vertical range and wide geographic distribution and should have evolutionary trends.This fossil need not to be rare to be called as index fossil.

Example: Calico scallop, Scaphites, Inoceramus, Leptodus.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.