Diagnosis: 1. Old Bessy's disease:
What symptoms does she have that make you think this?
2. Miss Daisy's disease:
What symptoms does she have that make you think this?
3. Little Susie-Lou's disease:
What symptoms does she have that make you think this?
In what order will you treat the three cows?

the index of refraction of the second medium is higher. i just took the test trust me !

the answer to your question is:

c. complementary base-pairing

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.