Please help me you guys :(

Which potential solution below best addresses the issue of loss of biodiversity in a north american ecosystem?

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.

Explain the process that creates the heat of the sun?