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.
1 A small aviary costs $500-$1,000. 2  Large aviaries can cost tens of thousands depending on the architecture and materials used. 3  The Avian Welfare Resource Center provides an online list by state of bird rescue groups.hopping for a pet bird: 1  Cages should be limited to a single species per cage. 2  Feed costs about $50 per year for small breeds. 3  Those wanting to create an aviary--a large outdoor structure used to house many birds together--find that finches and canaries live well together in the large units. 4  The Avian Welfare Resource Center provides an online ...