Questions

The given sentence is in simple past. No improvement required.

Persons with type AB blood are sometimes called universal donors is a FALSE statement. 

Persons with type AB blood are sometimes called universal recepients.

Persons with type O blood  are called universal donors.

A research paper is an extended article that shows your own assessment or content. When you write an article or essay, you put in everything that you actually know and your own views about the subject.

Types of research papers ::

1. Argumentative papers,
2. Analytical papers,
3. Definition papers,
4. Compare and contrast papers,
5. Cause and effect papers,
6. Reports, and.
7. Interpretive papers.

The three types of muscle fibers are slow oxidative (SO), fast oxidative (FO) and fast glycolytic (FG). Slow oxidative fibers use aerobic metabolism to produce low power contractions over long periods and are slow to fatigue.

India's first 'Fulldome 3D Digital Theatre' was inaugurated in Kolkata.

Only   1   and   2   are   correct,   as Mahatma  Gandhi’s  speech  in  BHU on 4 February,1916 did not include plight  of  untouchables  and  there was no issue of the mill owners on Ahmedabad in 1916.

From the history,

The Erie Canal was completed in 1800's

The signing of the Declaration of Independence in 1776 and after that the American Revolution was started in the same 1776.

The Iroquios Confederacy was formed early when the Europeans first began comonizing, may be early in 1600's.

So, from the above data of history, Iroquois tribes formed the Iroquois Confederacy was the event that occured first among the options.