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مشاهدة النسخة كاملة : Dinosaurs


انت عمرى
06-24-2014, 11:16 PM
Dinosaurs

Few subjects in the Earth sciences ar as fascinating to the general public as dinosaurs. The study of dinosaurs stretches our imaginations, provides U.S. new views on time and space, and invites U.S. to discover worlds very completely different from our trendy Earth.

From a scientific viewpoint, however, the study of dinosaurs is vital both for understanding the causes of past major extinctions of land animals and for understanding the changes in biological diversity caused by previous earth science and environmental condition changes of the world. These changes ar still occurring nowadays. A wealth of new info about dinosaurs has been learned over the past thirty years, and science's previous concepts of dinosaurs as slow, clumsy beasts are wholly rotated. This pamphlet contains answers to some commonly asked questions about dinosaurs, with current concepts and evidence to correct some long-lasting common misconceptions. though a lot of has been discovered recently about dinosaurs, there is still a good deal a lot of to be told about our planet and its ancient inhabitants.



When did the dinosaurs first seem on Earth?
The previousest archosaurian reptile sorts ar far-famed from rocks in Argentina and Brazil and ar about 230 million years old. the foremost primitive of those sorts, Eoraptor, was atiny low carnivorous archosaurian reptile. as a result of Eoraptor's skeleton shows some advanced skeletal features, older dinosaurs might nonetheless be found.


Did people and dinosaurs live at an equivalent time?
No! when the dinosaurs died out, nearly 65 million years passed before people appeared on Earth. However, tiny mammals (including shrew-sized primates) were alive at the time of the dinosaurs. several scientists WHO study dinosaurs (vertebrate paleontologists) now assume that birds ar direct descendants of one line of carnivorous dinosaurs, and a few think about that they indeed represent trendy living dinosaurs. This theory remains below discussion and shows that there is still a lot of we do not realize dinosaurs.


How ar dinosaurs named?
Dinosaurs usually ar named when a characteristic body feature, when the place where they were found, or when someone involved in the discovery. typically the name consists of 2 Greek or Latin words (or combinations); so as, these ar the genus (plural, genera) and also the species name. for instance, the Greek and Latin combination (binomen) tyrannosaur means that "king of the tyrant lizards." Biologists name trendy animals precisely the same means. Some examples include humans (Homo sapiens), pups (Canis familiaris), golden eagles (Aquila chrysaetos), box turtles (Terrapene carolina), and rattlesnakes (Crotalus horridus).


How long might a archosaurian reptile live?
Animal lifespans relate partly to their body size and partly to their sort of ****bolism. archosaurian reptile lifespans most likely varied in length from tens of years to hundreds of years. Their doable most age may be calculable from the maximum lifespans of contemporary reptiles, such as the 66-year lifespan of the common alligator (Alligator mississippiensis) and also the impressive lifespan of a Black Seychelles turtle (Geochelone (Aldabrachelys) sumeirei). One specimen of this now-extinct species, that was an adult once captured, lived a record 152 years in captivity (1766-1918) and had an accidental death. These estimates, supported lifespans of cold-blooded animals, would be too long if dinosaurs had ****bolisms a lot of kind of like trendy birds and mammals.


What did dinosaurs eat?
Some dinosaurs Greek deity lizards, turtles, eggs, or early mammals. Some afraid alternative dinosaurs or scavenged dead animals. Most, however, Greek deity plants (but not grass, that hadn't evolved yet). Rocks that contains archosaurian reptile bones additionally contain fossil pollen and spores that indicate a whole lot to thousands of sorts of plants existed during the geological era. several of those plants had edible leaves, including evergreen conifers (pine trees, redwoods, and their relatives), ferns, mosses, fern ally rushes, cycads, ginkos, and in the latter a part of the archosaurian reptile age flowering (fruiting) plants. though the precise time of origin for flowering plants continues to be uncertain, the last of the dinosaurs definitely had fruit out there to eat

ايمان
06-29-2014, 02:44 AM
It is nice topic