5GASFM

Birds have many physical features, besides wings, that work together to enable them to fly. They need lightweight, streamlined, rigid structures for flight. The four forces of flight – weight, lift, drag and thrust – affect the flight of birds.

Flying birds have: lightweight, smooth feathers – this reduces the forces of weight and drag a beak, instead of heavy, bony jaws and teeth – this reduces the force of weight an enlarged breastbone called a sternum for flight muscle attachment – this helps with the force of thrust light bones – a bird’s bones are basically hollow with air sacs and thin, tiny cross pieces to make bones stronger – this reduces the force of weight a rigid skeleton to provide firm attachments for powerful flight muscles – this helps with the force of thrust a streamlined body – this helps reduce the force of drag wings – these enable the force of lift.

Have you ever opened the hood of your car and wondered what was going on in there? A car engine can look like a big confusing jumble of metal, tubes and wires to the uninitiated.

s is pretty uncommon, just 11 out of every 1,000 Americans. This uncanny trait is caused by several factors, and can actually develop over tim

Sometimes, though, the concentration and distribution of melanin isn't uniform, which leads to a condition known as heterochromia. This condition can present itself in different ways. There's complete heterochromia, when each eye is a distinctly different color, say, one blue and one brown. Central heterochromia is when the eyes show various colors, such as a blue iris with a golden-brown ring around the pupil. And sectoral heterochromia is when one iris has a splash of color that's different from its overall hue, a trait that actress Kate Bosworth has.

Kids with ADHD have problems paying attention and sitting still in their seats,

Zoos are premises for the captivity of animals, often in urban areas where many of the animals would not otherwise be found, with the intention of studying the animals and displaying them to the public at large. The predecessor of the zoo was the menagerie, which involved the captivity of birds typically for the entertainment of the aristocracy, and has a long history running back to ancient times. The first modern zoo evolved out of an aristocratic menagerie in Vienna in 1765. Many types of zoo now exist, from the petting zoos that encourage the public to get up and close with the animals to the large nature reserves that provide space for the animals to roam around within and most famously the large, urban zoos like the London Zoo which include elephants, lions and penguins and are usually notable tourist drawcards for the cities concerned. Proponents argue that zoos are beneficial both to the animals themselves, protecting endangered species with specific breeding programs, and the public, as an educational tool to increase both awareness and understanding. Opponents respond that the removal of wild animals from their habitat is wrong, that they should be left in their natural surroundings and not used as tools for public entertainment. (shamelessly taken from our sister site idebate.org)

Zoos are premises for the captivity of animals, often in urban areas where many of the animals would not otherwise be found, with the intention of studying the animals and displaying them to the public at large. The predecessor of the zoo was the menagerie, which involved the captivity of birds typically for the entertainment of the aristocracy, and has a long history running back to ancient times. The first modern zoo evolved out of an aristocratic menagerie in Vienna in 1765. Many types of zoo now exist, from the petting zoos that encourage the public to get up and close with the animals to the large nature reserves that provide space for the animals to roam around within and most famously the large, urban zoos like the London Zoo which include elephants, lions and penguins and are usually notable tourist drawcards for the cities concerned. Proponents argue that zoos are beneficial both to the animals themselves, protecting endangered species with specific breeding programs, and the public, as an educational tool to increase both awareness and understanding. Opponents respond that the removal of wild animals from their habitat is wrong, that they should be left in their natural surroundings and not used as tools for public entertainment. Show less

The ocean is also salty from rainwater that falls onto rocks or land, picks up some salt in the earth, and then trickles down into the ocean! There are also some places in the ocean floor where salty gases and minerals from within the Earth get released into the ocean!