Which conditions caused disease and illness to spread throughout tenements? Select two options.lack of foodlack of privacyimproper sanitationlack of air circulationimproper building codes

Improper sanitation allowed waste and germs to spread, while a lack of air circulation made crowded tenements poorly ventilated and helped illness spread. These conditions made residents more vulnerable to disease; lack of privacy and improper building codes were problems, but they are not the two direct conditions asked for here.

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