Political, Mumbai Washington DC, and History
Answer:
Option C. Homes made out of materials found in their environment is the only correct one.
Explanation:
Options A, B and D are not correct as these are the examples of modern (popular) culture.
C is correct because it tells about some original customs that have been existing in a certain area for a longer period time and has a large tradition.
Answer:
Luminous; distance travelled
Explanation:
Cepheids, also called Cepheid Variables, are stars which brigthen and dim periodically. This behavior allows them to be used as cosmic yardsticks out to distances of a few tens of millions of light-years. a uniform function of their brightness. The reason Cepheids can be used to determine distance is because the are variable stars that change brightness according to a regular pattern Cepheid variable discovery allows one to know the true luminosity of a Cepheid by simply observing its pulsation period. This in turn allows one to determine the distance to the star, by comparing its known luminosity to its observed brightness.