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

• are extinct
• had hard parts
• were generally large
• were alive only for a short time

Step-by-step explanation:

• The index fossils are also called s the guide fossils and are used to identify the geological periods. The index fossils are known to have a short-range with the geographical distribution and have a rapid evolutionary trend.

• This is found during the Mesozoic era of the 245 to 65 million years. These are easily distinguished and identify the type of species and are recognized and were abundantly found during the cambrian and ordovician periods.