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.
As the weather warms up, consider an outdoor aviary for your pet bird. Outdoor aviaries can be very beautiful, and the birds and parrots that live in them have the advantage of fresh air, natural light and access to rain water.They also have room to fly and exercise. Consider the following points before setting up your bird in an outdoor aviary. Climate.utdoor aviaries can be very beautiful, and the birds and parrots that live in them have the advantage of fresh air, natural light and access to rain water. They also have room to fly and exercise. Consider the following points before setting up your bird in an outdoor aviary. Climate.