PCBs are mixtures of synthetic organic chemicals with the same basic chemical structure and similar physical properties ranging from oily liquids to waxy solids.
(PCBs; are; mixtures of synthetic organic chemicals with the same basic chemical structure and similar physical properties) (similar physical properties; ranging; from oily liquids; to waxy solids)
PCBs similar physical properties
are ranging
mixtures of synthetic organic chemicals with the same basic chemical structure and similar physical properties
from oily liquids to waxy solids