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One group of reptiles, characterized by the fossil ark metal x

How does the molecular clock work? a. it analyzes the brain functionality of two different species.b. it examines and compares the physical characteristics of two different species.c. it illustrates relationships between two different species.d. it compares the number of mutations that exist in the dna of two different species.

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called