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Over the past week, Walter has been learning to tie his shoelaces. Initially, his mother held his hands and worked his fingers through the process. Now that Walter is better at it, she only guides him verbally. This is an example of ________.
Genes
DNA segments that serve as the key functional units in hereditary transmission, determining aspects of an individual's physical and possibly behavioral traits.
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing baby and removing waste products.
Nutrients
Essential substances obtained from food that are necessary for the body to grow, maintain health, and carry out its functions.
Oxygen
A chemical element with symbol O and atomic number 8, essential for the respiration of most living organisms and for combustion.
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