Which of the following best describes what led to London’s “killer fog” in 1952?

a.
Pollution from the air contaminated the water supply which is what killed people.
b.
Millions of coal fires and stagnant air caused toxic fumes to build up in the air.
c.
Poor city design led to faulty ventilation in houses.
d.
Soot from forest and wildfires in the surrounding areas blew over the city.

b. millions of coal fires and stagnant air caused toxic fumes to build up in the air.

Explanation:

I looked up the question on Google and the answer was on there.

blah

explanation: bc blah

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.