What does Elliptical Marquee Tool do?

Which one is not a file extension for the JPEG format?

Which one is not an option for gradients?

Which one is not a marquee tool?

What does Ctrl+Shift+I (Command+Shift+I) do?

Definition of a snapshot?

.... makes the pixels you are painting appear behind the pixels already on that layer, while .... makes the pixels you paint transparent in brush panel.

What does the Use Global Light option in the Layer Style dialog box do when checked?

Which setting is available in the Lighting Effects dialog box?

Channels contain all the color information of a Photoshop document.

..... filter helps to draw perspective planes or a mesh grid that can be used in editing.