Answer:
Drastic changes in temperatures.
Explanation:
If it is warm, then it won’t be changing drasticlly, so pretty obvious ngl
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They are not aware of each other because usually they are sesperate and don't live together.
Answer: To be produced by meiosis
Explanation:
Answer:
Index fossils represents the fossils of the organisms that lived in a particular geological time zone. The index fossils defines a geological time of a dead organisms. Index fossil ensures that a correct order of geological time appears in a fossil record. The index fossils of organisms that lived for a short period, were abundant and widespread geographically.