Why is it important for geologist to use both relative and absolute ages determine the age of rock

Relative dating techniques provide geologists abundant evidence of the incredible vastness of geologic time and ancient age of many rocks and formations. However, in order to place absolute dates on the relative time scale, other dating methods must be considered. The age of the fossil must be determined so it can be compared to other fossil species from the same time period. ... Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.

Explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

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