Explain what typically marks the beginning and end of any division of time on the geologic time scale?

What normally marks the beginning and end of different time periods are huge event that happened and changed the way of living and thinking of humans.

Determine the cause of death for anna garcia

we need additional information in order to determine the cause of death for anna garcia. there are at least 3 things with explanation included as to why we need them are as follows:

there would be some predate medical situations.there would be a report about the cause that why she was there for backache from the hospital.there would be a report about what she injected in her thigh that she suffered from backache.