Remember that prokaryotic cells are simple and do not contain membrane-bound organelles and that eukaryotic cells are more complex and do contain membrane-bound organelles, as well as a nucleus. The endosymbiosis theory explains how eukaryotic cells may have evolved from prokaryotic cells. Symbiosis is a close relationship between two different organisms. We saw that, over time, one ancient cell became the host for other ancient cells that were capable of specific activities.
aviary, An aviary is a large enclosure for confining birds. Unlike cages, aviaries allow birds a larger living space where they can fly; hence, aviaries are also sometimes known as flight cages. Aviaries often contain plants and shrubbery to simulate a natural environment.
The Aviary. Your outdoor aviary should be placed in a low-traffic area so the birds have a peaceful living environment. If the temperatures drop at night or during winter months, you must bring the birds inside to a warmer environment. Make sure the inside of the cage has plenty of perches for birds to sit on.ave. BananaStock/BananaStock/Getty Images. Budgies -- also referred to as budgerigars or parakeets -- are small, brightly colored birds that are commonly kept as household pets. These intelligent little birds are relatively inexpensive to keep and when trained properly can learn to talk.