In a business letter, the name in a salutation should be followed by a colon.
The salutation should read as follows:
Dear Mr. Smith:
As far as I know both oxygenated and deoxygenated flow through diffent parts of the heart
What book is this? You should put the name of the book before posting this question.
A. The commas are needed between their names as they are separating different clauses. <span />
Jane goes to work on a bus
Jane goes to work in a bus
Jane goes to work by a bus