Question

Index Fossils
Fossils that help with dating are called index fossils.
Index fossils formed from that
• were alive for only a period of geologic time.
• are extinct.
• had hard parts such as shells, bones, and teeth.
• lived across a wide area.

The answer choice is short, relative, geographic, organisms

Answer 1

Im not sure what the choices are but index fossils can help with the geological time scale and they are traces of animals left behind that became fossilized. Hope this helps シ