Answer:
harmful algal bloom (HAB)
Explanation:
Harmful algal bloom (HAB) -
It refers to the combination of various organisms , that reduces the level of oxygen in natural water , and which can make the survival of the marine organisms difficult , is referred to as harmful algal bloom (HAB) .
These blooms can live for some days to months , as they die , the microbes decomposes them and consume even more amount of oxygen , making the survival of the marine organisms , near to impossible .
Hence , from the given scenario of the question ,
The correct answer is harmful algal bloom (HAB) .
Answer:
D) Typhus fever
Explanation:
Typhus fever is a group of infectious disease which includes different types of typhus like scrub typhus and murine typhus.
The typhus disease is spread by the lice and fleas which carries the typhus causing bacteria.
The typhus disease killed almost 3 million people before and during World War I, so the research on the typhus showed that disease is caused by the lice and other fleas. Although vaccine was prepared during World War II, to control the disease DDT was sprayed to kill the lice as an insecticide.
Thus, Option-D is the correct answer.
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