No, you can't juice things with oil in them, it can ruin the juicer
Pizza juice
Juicer is a device used in making juice
yes
Not every juicer can juice wheatgrass. You need one that can chop up the blades of grass. A centrifugal type of juicer won't do that. A masticating or triturating juicer will. See the link for some good wheatgrass juicers.
To juice a lemon without a juicer, you can roll the lemon on a hard surface to soften it, then cut it in half and squeeze the juice out using your hands or a fork.
You can use a juice seed to make drinks with the juicer.
The juicer auger helps to crush and squeeze fruits and vegetables to extract their juice efficiently.
no
To press the juice
There are a lot of recipes I foud here.http://zestycook.com/the-power-of-juice-juicer-recipes/
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To juice lemons without a juicer, you can use a fork to pierce the lemon and twist it while squeezing to extract the juice. Alternatively, you can roll the lemon on a hard surface before cutting it in half and squeezing the juice out by hand.