Question

Which phrases describe organisms that formed index fossils? Check all that apply.

are extinct
had hard parts
were generally large
were alive only for a short time
lived in a narrow geographic area

Answer 1

Hi,

The answer to the above question is;

Organisms that formed index fossils;

• Have hard parts
• Were generally large
• Lived in a narrow range of geographical area
• Are extinct

I hope you are satisfied. Thanks for asking.

Answer 2

Answer:

1. are extinct

2. were alive only for a short time.

Certain flaural and faunal species were restricted to a particular geologic (time) era. The index fossils are also known as guide fossils. These are abundant and easily identifiable fossils with a wide geographic distribution and a short time range for life. Geologic range of extinct species can be estimated by index fossil.