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.
Active Pursuits. The best time to travel to the Panama Canal depends on how you'll spend your time, Lonely Planet concedes. Hike during the dry season from mid-December until May and bring warm clothes if you're going to high altitudes in Boquete, El Valle or Cerro Punta. December to May is also a great time for surfing big waves and diving in clear waters.