Comparing cells- size and shape relate to

Galaxy whose shape seems different follow no set pattern are classified as

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.

Which example would the nurse consider to be a part of systems thinking theory?