Which choice will allow you to manipulate a layer without making changes to the source file?

Correct resolution for images used on the web?

Shortcut to zoom in?

Fastest way to select a black object on a white background?

How do you non-destructively change what is shown in an image?

Shortcut for the eyedrop tool, color sampler tool, ruler tool, note tool and count tool?

Changing pixel dimensions...

For the 'Magnetic lasso tool', a higher value detects lower-contrast edges; a lower value detects only edges that contrast sharply with their surroundings.

You can apply transformations to the background as a layer. You cannot however, transform selections on the background.

'Resampling' refer to?

Which Tool or Effect has led to the effect in the image?