Why are the eastern and western meadowlarks considered different species?

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 is the average speed of a car that traveled 300.0 miles in 5.5 hours

Me the formula cacl2 represents the compound