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Critics of the use of ability grouping in schools have charged that
Peptide Hormone
Chemical messengers synthesized as peptides and regulate physiological processes, including growth, appetite, and metabolism.
Phthalates
A group of chemicals used to make plastics more flexible and harder to break, often found in various consumer products.
PCBs
Polychlorinated biphenyls, a group of man-made organic chemicals known for their environmental persistence and potential health hazards.
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