Select the word from the list that best fits the definition a kind of nonfoliated metamorphic rock

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.

What's the waste product of electrons and pyruvate combining in fermentation?  

Describe the two types of vascular tissue