Chantek the orangutan is one of many nonhuman primates that scholars have used to draw conclusions about the origins of human language because they seem to be able to learn how to do what?
a) speak a handful of basic english words

b) speak to other nonhuman primates with their own spoken language

c) communicate through sign language

d) communicate through drawing

the correct option is C(communicate through sign language)

Explanation:

Chantek the orangutan is one of many nonhuman primates that scholars have used to draw conclusions about the origins of human language because they seem to be able to communicate through sign language. Taught by American anthropologists Lyn Miles and Ann Southcombe Channel the orangutan learnt how to communicate using that American sign language.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.