You must always state both your claim and your supporting evidence explicitly; one without the other is either pointless evidence or an ungrounded opinion.
Taking a fairly straightforward example:
“I know it rained last night because the streets are wet.”
What are you trying to demonstrate?
|I know it rained last night|
|Evidence What proof do you have?||the streets are wet|
It would be difficult to take issue with this claim/evidence relationship.
But most claim/evidence relationships are not so simple; most will require an additional element: a warrant.