Health officials said they're worried about the lack of demand for doses of the COVID-19 vaccine, which has dropped significantly this week. Many California counties are experiencing similar issues as supply of the vaccines is outweighing demand. California’s underwater kelp forests are in trouble. A combination of climate change and hungry purple sea urchins have decimated these vital marine habitats. But the Monterey Peninsula has a kind of kelp forest guardian -- sea otters.  Reporter: Erika Mahoney, KAZU Disneyland and Disney California Adventure opened to guests Friday for the first time in more than 13 months. The parks have COVID-19 safety protocols in place and are limiting capacity to 25% for now. Guest: Gavin Doyle, Founder of the website MickeyVisit.com Everyone 16-and-up is eligible for the COVID-19 vaccine -- and it’s now easier for older teenagers in L.A. County to get the shot. They can now bring a signed consent form with them, rather than have their parents there in person. Reporter: Jackie Fortier, KPCC  Immigration rights activists in California and across the country are planning marches Saturday to call on Congress to legalize millions of unauthorized immigrants in the country. Reporter: Tyche Hendricks, KQED  Learn more about your ad choices. Visit megaphone.fm/adchoices