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An important development during the concrete operational stage is a better understanding of relational logic. Identify two mental operations necessary to successfully answer problems involving relational logic.
Alveoli
Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.
Diaphragm
A dome-shaped, muscular partition separating the thorax from the abdomen in mammals, playing a major role in breathing by contracting and expanding the lungs.
Bronchi
The large air passages that lead from the trachea (windpipe) into the lungs and become smaller tubes within the lungs called bronchioles.
Trachea
A large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes, conveying air to and from the lungs.
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