<em>The </em><em>Answer is attached </em>
Explanation:
A. the evolution of the first air-breathing animals that could live on land
Explanation:
The event or set of events that is the most significant part of all the given options is that of the evolution of the first air-breathing animals that could live on land.
- The geologic time scale records deep time.
- It places events in order of their occurrence.
- Geologic time scale extends from the time of the earth's formation present.
- It preserves a record of land mark events that has shaped the earth.
- The evolution of the first air-breathing animals that could live on land is a significant event that occurred millions of years ago and it is a significant part of the geologic time scale.
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Answer:
Organic matter produced when an organism is alive remains unchanged in unaltered fossil while the opposite happens in cases of altered fossil
Explanation:
When the organic material produced by an organism during the time period when it was alive remains unchanged in the given course of time then it is termed as unaltered or original preservation. for example - bones, teeth etc, remain intact.
While in case if the organic material produced by an organism during the time period when it was alive changes in due course of time by the external forces is called as altered fossil