are extinct, had hard parts,were generally large and were alive only for a short time.
Explanation:
Index fossils typically are extinct organisms that have hard parts that have been preserved till date. They are generally large in population but their body size might vary and only alive for a short period in time.
- Index fossils are also known as guide fossils or indicator fossils.
- They help to define geologic periods more appropriately and fittingly.
- Like every other remains of organisms preserved in rocks, they must have preservable hard parts.
- Their population must be abundant so as to increase their chances of being preserved.
- They must also be extinct. Extinction is the mass loss of a specie. If they are not extinct, they might not be good indicators of time. Extinction confines the life history of organism into a proper time frame.
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Answer:
Heat transfer, CO2, O2, water transfer.
Explanation:
The answer to this question is C. In the 1800s mexico and the United states fought for territory near Texas, and eventually won after many engagements, such as the Alamo. Hope I helped.
A is the correct response
