Aight, ik this aint a assignment question, but im just curious, can PTSD and depression kill you? (I have both which is why im askin)

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 distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?