Squalor caused disease to spread because... 1. Few houses had inside baths or Many people hardly ever washed.
2. There was no proper sanitation. was just dumped in the streets.
3. Rooms were badly ventilated, especially those in
dwellings.
4. Rubbish in the street encouraged
5. Drinking was often contaminated.
6. Houses were often damp and in poor repair, with floors of earth

Word Options:
sewage
earth
toilets
water
vermin
cellar
bare

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radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.