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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.

The first amino acid of a new polypeptide chain is

1. describe the structure and function of the specialized cells you observed in the video. 2. research the types of cells present in the kidney.