Using the periodic table in Fig. 2.3, select the element that would be found in LEAST abundance in a living cell. 
Definitions:
Ethological Principles
Theories and methods derived from the study of animal behavior in natural environments, often applied to human psychology.
Mother-Infant Bond
The deep, emotional connection that develops between a mother and her newborn, facilitating attachment and significantly impacting the infant's development.
Bonding Process
The development of a close, interpersonal relationship between individuals, such as between parents and their child.
Ecological Approach
A perspective in various disciplines that emphasizes the complex interactions between organisms and their environments.
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