Answer:
sorry I don't know understand
Index fossils (also known as guide
fossils, indicator fossils or zone
fossils) are fossils used to define
and identify geologic periods (or
faunal stages).
For the first question, it's D. And the second question it's C.
Answer:
The answer is a) allopatric speciation.
Explanation:
Allopatric speciation happens when a geographical or physical barrier is introduced in a population. After this, the reproductive isolation, genetic recombination and also random mutations can promote the speciation process, where at the end, there will be two separate species.
C a broad,evidence-based explanation for a phenomenon
