3. Text Birds (class Aves) are wingd, bipedal, endothermic (warm-blooded), vertebrate animals that lay eggs. There are around 10,000 living species, making them the most numerous tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Birds range in size from the 5 cm (2 in) Bee Hummingbird to the 3 m (10 ft) Ostrich. The fossil record indicates that birds evolved from the ropod dinosaurs during the Jurassic period, around 150–200 Ma (million years ago), and the earliest known bird is the Late Jurassic Archaeopteryx , c 150–145 Ma. Most paleontologists regard birds as the only clade of dinosaurs to have survived the Cretaceous–Tertiary extinction event approximately 65.5 Ma. Modern birds are characterized by feathers, a beak with no teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. All birds have forelimbs modified as wings and most can fly, with some exceptions including ratites, penguins, and a number of diverse endemic island species.
4. Definition Video: a recording of both the visual and audible components (especially one containing a recording of a movie or television program) video - broadcasting visual images of stationary or moving objects
5. Questioner Questions for teacher: 1- I think that using video in teaching enhance my students achievement?
13. Studies A study by Rockman et al. (1996) of the academic impact of home and school: - Students who watched the program were able to provide more complete and complex explanations of scientific concepts after viewing the show. - The gaps in knowledge base between boys and girls and between minority and majority students were smaller and closer to parity after viewing the program.
14. Studies A study of the children’s problem-solving skills (Fisch, 2003). : Viewers out performed nonveiwers in solving problems and produced more sophisticated solutions. A study on the use of instructional television with eighth grade students (Barnes, 1997). : Students in the classes which included the television programming outperformed the control groups in test scores, writing assignments, in variety and creativity of problem-solving skills, and in their engagement in class discussion.
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16. challenges Lack of resources Lack of equipment Lack of required software Technical problems Lack of legibility of audio and visuals
