Â· just now. Report Abuse. It takes a good 6-8 weeks for a break to heal properly. A compound fracture, spiral fracture or complete break would take closer to 8 weeks. A greenstick fracture could heal in as little as 4-6.eport Abuse. Most broken bones begin to heal within 48 hours however depending on the type and severity of the break it could take anywhere from 4 to 8 weeks to completely heal.
Science Main Index. Animals with an internal skeleton made of bone are called vertebrates. Vertebrates include fish, amphibians, reptiles, birds, mammals, primates, rodents and marsupials. Although vertebrates represent only a very small percentage of all animals, their size and mobility often allow them to dominate their environment.
All these animals are characterised by a tough outer body-shell or exoskeleton, with flexible joints between the skeletal plates to allow the animal to move. The main external body features which distinguish each of the four major Classes of living arthropods, Crustacea, Myriapoda, Arachnida and Insecta, are shown below (with those that separate the insects from all other groups highlighted in red).