Yes. all vegan foods contain protein; apart from fruit and oils.
If you are eating enough calories from a wide variety of foods you will be getting enough protein.
Tofu has protein as well as nuts, rice and vegetables. There should be no reason why a vegan would not consume enough protein out of their normal foods. It should not be necessary to take supplements although these are available from most health shops.
Lettuce and celery
Vegans can do any sport that a non-vegan can do. They may have trouble with getting enough protein for sports that require intense muscle-building, however.
If you don't consume enough nutrients, such as protein and calcium, then a vegan diet can harm you because these are nutrients from main food groups you aren't eating.
No, a well balanced vegan or vegetariandiet can be perfectly healthy. If you are a vegan or vegetarian, you will need to be careful to make sure you're getting enough protein and B-vitamins from other sources.
Any human, vegan or otherwise, who does not get enough protein, develops a deficiency disease called kwashiorkor. Because you're reading this on Answers, I'm guessing that you live in a developed part of the world. If that is the case, you probably don't know anyone with kwashiorkor. That's because it's extremely rare unless you are starving. If you eat enough calories of almost any unrefined food or combination of foods, you will get enough protein.
Some protein sources in the vegan diet are tofu, veggie burgers, and protein supplements like smoothies. There are many choices for proteins for vegan diets. Vegans can eat fruits, vegetables, nuts and grains, and many types of beans.
If you are looking for Vegan protein substitute, try Amazon as they have a big choice and they seem to be cheap and they are more reliable than some other websites.
There are a few sites that you can check. There is http://www.vrg.org, for starters. Another site you can check is www.veganproteins.com, which specifically discusses protein in a vegan diet.
A vegan diet takes serious planning. You can't just eliminate all animal products and hope for the best. There are innumerable website and countless books that details how you can safely, and healthfully change your diet to a vegan eating plan. Have a look at these websites: http://www.vegansociety.com/become-a-vegan/ AND Vegan.com AND features.peta.org/VegetarianStarterKit/index.asp
No. Casein is a protein found in cows milk.
Vegan food means no meat. Where you can get enough calories, nutrition and vitamin's.