Which was the first being on earth?

The first living being on Earth was the human race. In further detail, it was Prophet Addam(aa-dhum)who was the first life form sent to Earth by Allah.

Live evolved from lower orders of organisation, gradually getting more and more complex. Obviously there is no record of in existence of who 'who' was the first living thing.

Some religions claim that man was created as he is today. Who that person was would depend on which religion you wish to believe. If any.

Plants are the first in creation as far as scientific knowledge goes.