Why is the Human Genome Project called a mega project?

Explanation

The human genome project (HGP) is called as a mega project because of the following reasons:
(i) It look 13 years to complete.
(ii) It is the first vertebrate genome to be completed.
(iii) Human genome is about 25 times larger than the genome of any other organism sequenced so far.
(iv) Human genome is said to have approximately `3xx10^(9)`bp.