Why did president harry truman decide to hit the japanese cities of hiroshima and nagasaki with two atomic bombs in 1945? a) he knew doing so would win him another term as u. s. president. b) he wanted revenge of the japan's use of atomic bombs on pearl harbor. c) he agreed to do it because germany was ready to use an atomic bomb on england. d) he hoped to prevent a ground invasion of japan and save the lives of american soldiers.

The correct answer would be option D, He hoped to prevent a ground invasion of Japan and save the lives of American Soldiers.

Explanation:

In 1945, United States President, Harry Truman hit Japan's two cities, Nagasaki and Hiroshima with atomic bombs. He dropped the bombs to prevent the Japanese ground invasion and to save to lives of American soldiers. Also it would cost them high, would be truly difficult to handle and would be extremely terrible, because Japanese attacks were so brutal and no country wanted to confront them one on one on ground. That is one of the many reasons why US president dropped atomic bombs on Japan's cities.

as university of miami psychologists debra lieberman and adam smith pointed out in a recent article in the journal current directions in psychological science, humans have social and psychological mechanisms to deter incest. with very few exceptions, marriages between brothers and sisters and between parents and their children are verboten in every human culture. the primary psychological anti-incest mechanism is the yuck response. even the idea of sex with their mom or dad, bro or sis is upsetting to most people. the psychologist jonathan haidt has found that nearly everyone is repelled by the prospect of brother-sister sex, even in hypothetical situations in which there is no chance of pregnancy).

the biological cost of incest

this raises an interesting question: just what’s so bad about incest? sure, having sex with your dad or your sister seems gross — but why? some anthropologists have argued that incest taboos are learned social conventions. this explanation, however, doesn’t make sense to me as it does not explain the widespread existence of anti-incest mechanisms in creatures ranging from cockroaches to chimpanzees. second, the incest taboo is about as close to a universal law as human moral rules get.

why should mechanisms to avoid incest be so widespread both in nature and across human societies? the answer is simple. the problem with having sex close with relatives is that there is an astonishingly high chance that your offspring will be born with a serious birth defect.

the answer is "meiosis ii in the mother".

the procedure of meiosis includes two divisions of the hereditary material. the main division is known as the decrease division – or meiosis i – on the grounds that it lessens the quantity of chromosomes from 46 chromosomes or 2n to 23 chromosomes or (n depicts a solitary chromosome set). in people, the decrease division results in two sperm cells each with 23 chromosomes or an egg cell with 23 chromosomes and one disposed of polar body. the second division – or meiosis ii – is called equational division. the two sperm cells split again creating four sperm cells, each with 23 or n chromosomes. in oogenesis, the egg cell and polar body partition to shape the ovum and two extra polar bodies. along these lines, the posterity are guaranteed to get one portion of the chromosomes from the mother and one half from the dad.