Do any of you know anything about bears? If you do can you help me?

I am an animal/bear expert and I will be honored to help you answer your questions:
1. No, baby bears cannot surivie without their mother's care because if so, they could be eaten or attacked by other bears or even other animals such as cougars and wolves. But without their mother's care, they will not be able to live without their mother's milk or unless if the cubs are a few months of age, they may not be able to surive long enough without protection.
2. Grizzly Bears can eat wild berries, nuts, fish, and other animals such as deer and elk.
3. When a bear cub is found without its mother, it might either try to take care of itself by defeinding itself away from any other animal (including other bears) or it may end up dying.
4. Bears attack humans because due to the fact that humans are attacking them and their homes. If humans will learn to accept a bear's privacy or living, they will not attack. Sometimes, they may even terroize neighborhoods just for the search of food.
5. Yes and no. If the cub is only a few years old and if it learned the tricks of how to defend itself from its mother, it will be able to protect itself from preadtors. But if the cub didn't learn the skills however, it might not be protected. (But sometimes, cubs will climb on trees to escape from an enemie's clutches)

I hope my answers help you a lot. :)