Monkeys can certainly survive in North America. The Mystery Monkey of Tampa is proof enough of that. But for them to survive here, they have to get here--the monkeys that were here, the Platyrrhines, aren't the ones to survive in a place like Tampa.
Most people enroll in Part A. when they are first eligible for Medicare because there is no premium for Part A if you have. worked and contributed to Social Security for at least 10 years. However, when you should. enroll in Part B depends in large part on how many employees work for your employer.
When you retire, you will have a special enrollment period of eight months to sign up for Part B, without penalty. If your employer has fewer than 20 employees, however, you should enroll in Medicare Part B when you are first eligible. Medicare is the primary insurer, which means it pays before your employer's insurance pays. If you don't enroll, your employer's plan can refuse to cover you for services that Medicare would have covered.