In chapter 6, what parallel is suggested by the fact that Gatsby never gets the inheritance bequeathed to him by Cody?

Also, it might be symbolic for the fact that Gatsby, even though he has acquired a vast fortune, will never be part of the "old, established aristocracy", of the "West Egg society". Even though, after he becomes involved in illegal activities he is wealthy, he will never be accepted by the established society (to which Tom and Daisy belong), who got their money traditionally, namely by inheritance; because he got his money through the "American Dream". This shows the futility of his American Dream, and how even achieving it will not land him the ultimate object of his strife: Daisy.
Even though Gatsby thinks he will inherit Cody's fortune, he never actually does; and even though he thinks he will get Daisy's love by becoming wealthy, he never actually does.

In Rebecca, the novel of Daphne du Maurier, what is the comparison of Maxim's relationships with his first and second wives ?

There are many differences between the Maxim's relationship with Rebecca and his relationship with his second wife, the story's narrator.  The main similarity was that secrets were kept in each marriage.  In the first marriage the secrets were Rebecca's and in the second marriage the secrets were Maxim's.  The major difference between the two marriages is that while Rebecca was an evil and unfaithful woman who cared little if at all for Maxim, his second wife was a good and somewhat naive woman who loved and wanted to please her husband.  The irony was that the second wife spends most of the novel assuming that she was second best and that her husband was still mourning his beautiful first wife.  Furthermore in the first marriage it seems that Rebecca was definitely the stronger of the two personalities.  In the second marriage it initially seems that Maxim is the stronger personality but as Maxim's secret comes to light as well as his love for his second wife, her character becomes stronger.  Unfortunately for Maxim, the damage caused by his first wife did not end with her death and ended up costing him his lovely home leaving him and his second wife as virtual exiles.

What are the different types of Diabetes and what are the differences in age of onset, probable causes, symptoms, and treatments. What are some...

There are few different kinds of diabetes.  You can have
Type 1 Diabetes, Type 2 Diabetes, and Gestational
Diabetes.

Type 1 Diabetes usually develops in childhood and
young adulthood. The exact cause is unknown, but most likely there is a viral or
environmental trigger in genetically susceptible people that causes an immune reaction.
The body's white blood cells mistakenly attack the insulin-producing pancreatic beta
cells. The end result is the body is no longer able to produce
insulin. 

Type 2 Diabetes commonly develops mature adults
although there has been a rise in childhood Type 2 Diabetes. It develops in people who
have a low activity level, poor diet, and excess fat around the waist.  Type 2 Diabetes
usually develops gradually.  Excess fat has been linked with Type 2 Diabetes because fat
interferes with the body's ability to use
insulin.

Gestational Diabetes occurs during pregnancy. 
Common risk factors are African or Hispanic ancestry, obesity, being older than 25 while
pregnant, family history of diabetes, and etc.

The symptoms
of diabetes are high sugar levels in the body known as hyperglycemia. Other symptoms are
blurry vision,excessive thirst, fatigue, frequent urination, and
hunger.

Long term complications are atherosclerosis,
coronary artery disease, neuropathy, hypertension, and
stroke.

Treatment includes lifestyle couseling, insuline
therapy, and medication.

What the is the relationship between Juilet and her mom in "Romeo and Juliet"?

The relationship could at worst be called cold, but would probably best be called "formal".  They are not warm with one another.  Their is no trust and comfort between them.  Juliet has been, in the custom of the time, raised by her Nurse, who not only breastfed Juliet, but also served as her confidante and comforter.  The proof of this is evident when Juliet seeks out the Nurse for assistance in securing Romeo. 

However, the scenes between Juliet and Lady Capulet show two people who are mere acquaintances.  When Lady Capulet approaches Juliet about the idea of marriage, she is not comfortable to do so without the Nurse present.  Juliet's responses to her mother are short and obedient - she calls marriage an "honor" and promises to be ruled by her parents' consent.  Later, after Tybalt's death, Lady Capulet comes to Juliet in the belief that she is bringing news that will comfort Juliet.  In this scene, as she tells Juliet of the impending marriage to Romeo, Juliet is sarcastic and deceitful in her answers, and much less obedient.  Now she is married, she has no use for her mother, and has no sense of loyalty to her.  Lady Capulet does not know her daughter enough to realize she is lying.

What is the significance of the following quote from "Macbeth"? (act 3, scene 4) The time has been/that when the brains were out, the man would...

Macbeth is at the banquet and he has just seen the ghost of Banquo. He is perturbed because, he says, it used to be that when you killed a man, he would just die, and that would be the end of it. This is significant in part because it is Macbeth's guilt that makes Banquo's ghost appear.  In the past, Macbeth killed only for his country and had no reason to feel guilty.

Who was Alexander the Great?

There is not enough room here to fully answer this question.

Alexander was the son of Philip II, King of Macedonia. Olympias, his mother, was not Macedonian. So when Philip married a second wife, named Cleopatra, who was, it was feared that his life might be in danger. Indeed, at the wedding feast, Cleopatra's father made a comment about Philip's finally being able to have a legitimate heir. Olympias and Alexander left Macedonia and stayed away until Philip's death.

When Philip died, Alexander returned to Macedonia and secured his place on the throne by killing Cleopatra and her baby son. Almost immediately he had to go to war against the city-states that had supported his father but were unsure of him as a ruler. He conquered Athens, Thebes, and most of Greece. He then traveled to Egypt, where he was welcomed. He ordered the building of Alexandria, which became Egypt's new capital and was a center for culture and learning.

In his final campaign, Alexander went to war against the Persian Empire and defeated King Darius. Alexander is called "the Great" because it seemed that he could not lose. Wherever he went, he took the Greek language and culture with him, which we call today Hellenization, for the Greek name of Greece.

Alexander's death at age 33 is mysterious and unsolved. Some think he was poisoned; others believe he contracted an intestinal virus or other disease.

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Which character is most responsible for the untimely deaths of Romeo and Juliet?

Romeo and Juliet, while old enough to fall in love and get married secretly, are still only children.  They did have the courage to defy their families secretly but not out in the open.  They went to the Friar and the Nurse for help.

The Nurse is actively involved from Act 1 where the two meet at the ball and then pine for each other and for their misfortunes for having fallen in love with the enemy.  She is the one who listens to Juliet's wimpering and the Nurse runs errands to Romeo and to the Friar on the children's behalf.  All this running around in secret has caused a more desperate situation than necessary, when she should have spoken up.  However, remembering that she is a hired helper rather than a noble woman or family member may have had something to do with her compliance.  She acts for Juliet out of love for the girl.

The Friar also should have spoken up.  He is responsible for marrying the two and then arranging for Juliet's supposed death so that she may escape with Romeo to parts unknown.  His note goes astray so that Romeo hears only that his wife is dead.  She wakes up only to learn that her husband has killed himself, and she quickly follows.

Had the Nurse and Friar confessed to the marriage, the children wouldn't both be dead.  However, the feud probably wouldn't be resolved and the two would have been forced to get an anullment since their families would not have stood for secret marriages.