Chemical formula of DDT on a blackboard
Schlüsselwörter
ddt,
chemical,
formula,
illustration,
molecular,
pesticide,
chemistry,
poison,
molecular,
insecticide,
structure,
structural,
symbol,
signs,
element,
science,
scientific,
model,
herbicide,
synthetic,
agriculture,
research,
cancer,
blackboard,
chalk
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