Ka is the correct answer.
The ancient egyptians were all about preserving their essence for the afterlife. In ancient religion, Ka was a principal aspect of the soul of a human being or of a god. Egyptians believed that their ka was able to inhabit their corpses and live on afterlife. The belief on Ka led people to believe that mummification was necessary in order to maitain the body of the deceased person intact, if one didn't take the necessary steps then they would cease to exist after death.
Answer: E. Carcinogen
Explanation: The formation of cancer is often termed as carcinogenesis. Carcinogenesis is caused by carcinogens which can be a substances in air, radiation which could cause carcinogenesis, carcinogens may also be used to describe factors such as environmental, chemical or etiquettes which could result in the formation of carcinogenic cells.
Hence, carcinogen is any sort of substance or condition that can directly result to cancer. It could be a chemical substance, a virus, or medications and radiation used in the treatment of cancer.
Answer:
A market for cats would have had a positive externality.
Because the cats would kill the rats on sight since that is their natural behavior.
However, it is interesting to mention, that the cat's killing has been more of a "mythic" aspect of this story, since it fails to take into account that since the black death was caused by the<em> yersinia pestis</em> bacteria, cats could have been also infected, and since their interactions with humans are greater than rats or fleas, the real outcome could have been totally unexpected.