Arteries are normally depicted as red while veins are colored blue due to the oxygenation of the blood being transported by each type of vessel. the exceptions to this rule are the arteries and veins.

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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 was the land like over 500 million years ago? what was under the sea?