NASA discovers unique new life form

It's not an arsenic-based life form, so yo. It will prefer phosphorus over arsenic anyday, but can survive with arsenic. That means it won't use arsenic if it got the possibility to get phosphorus.

This is not a huge step for the evolutionary science I'm afraid: This most likely evolved from life not able to cope with arsenic. It's like when animals couldn't handle the UV-rays and got cancer because of it. Now we're more resistant to it, and we don't die if we walk outside.

Did you just attempt to draw an analogy between arsenic and UV light?