National Parks? Please help!!!?

Please hep me… i can’t find any information on these questions. I am doing a project on national parks. i have found information on most of the stuff i have to include, but i haven’t found anything on these.How would CA be different without them? and How well are we utilizing it? Are we over using it?Underusing it?How does CA current and growing population affect them?

Please no rude answers, i am doing my own homework! Thanks in advance for any answers! : – )

You might find some of the information you are looking for if you look up the individual National Parks within CA. I put some of the sites below.
There was too much information and I didn’t want to just copy and paste but hopefully these will help.