English reading - i am from poland, can you check it for me?

Magnesium is the fourth most abundant mineral in the body and is essential to good health. magnesium is needed for more than 300 biochemical reactions in the body. it maintain normal muscle and nerve function, keep bones strong, keep one’s heart rhythm steady, and supports a healthy immune system. magnesium also regulate blood sugar levels, promotes normal blood pressure, and may play a role in energy metabolism and protein synthesis. doctors and scientists are trying to determine whether magnesium may play a role in preventing and managing disorders such as hypertension, cardiovascular disease, and diabetes. which is the main idea of this paragraph? a. the role of magnesium in human nutrition is being studied intensely. b. magnesium may be related to the body’s metabolism and other healthy functions. c. magnesium appears to contribute to hypertension, cardiovascular disease, and diabetes. d. magnesium and a healthy immune system are separate diseases.

Apex english 4 semester 1 read the following story summary. when she was a child, sara hated her piano instructor, mr. singh. she felt she had already mastered the piano, but mr. singh constantly criticized her playing in a blunt and hurtful way. after sara grew up, she realized that mr. singh's strictness was responsible for the only edge she had over other pianists her age and the only reason she was able to succeed in music later in life. she learned to appreciate his tough love. what does the story most clearly suggest about the author's perspective? a.that a person should put his or her talents to good use b.that pursuing one's dream is paramount in life c.that the world is harsh and only the strong survive d.that adults have children's best interests in mind

What makes the literal, word-for-word translation of “the metamorphosis” hard to read