Honestly, we could come up with reasons all day, but the simple fact is that eukaryotic cells are up first. C'est la vie. Eukaryotic Cell Structure and Function A cell is defined as eukaryotic if it has a membrane-bound nucleus. Any organism composed of eukaryotic cells is also considered a eukaryotic organism. Case in point: you. Oh, and all other people, too. Biologists do not know of any organism that is composed of both eukaryotic and prokaryotic cells.
Best Time to Visit Cuba. The best time to visit Cuba is between December and April. The weather at this time is very pleasant and dry. The temperature at night can even drop down to below 20 degrees in these months. The tourist peak season runs from December to April, peaking around Christmas and on Easter weekend.
The Cuban Tourist Card allows you to stay in Cuba for 30 days. If you plan to stay longer than 30 days in Cuba you can extend your Cuban Tourist Card at Immigration in Cuba for another 30 days at a cost of 25 CUC. The maximum length of stay in Cuba with a Tourist Card is 60 days.