Rate the following argument fragment on its writing, argument, and language skills:
Concluding Statement: Overall aliens could'nt of caused this landform. There is no evidence of aliens being on Mars. There is only fiction stories about it, and on radio talk shows. NASA has went on three missions to prove it's a natural landform, and they were'nt able to find alien markings. If this isn't enough evidenve to convince someone they must be a big alien fan.

Score: 1