ancestor: A predecessor. It might be a household forebearer, reminiscent of a mother or father, grandparent or great-great-great grandparent. Or it might be a species, genus, household or different order of organisms from which some later one developed. For example, historic dinosaurs are the ancestors of at the moment’s birds. (antonym: descendant)
aquatic: An adjective that refers to water.
birds: Heat-blooded animals with wings that first confirmed up in the course of the time of the dinosaurs. Birds are jacketed in feathers and produce younger from the eggs they deposit in some type of nest. Most birds fly, however all through historical past there have been the occasional species that don’t.
Cretaceous: A geologic time interval that included the top of the Age of Dinosaurs. It ran from roughly 145.5 million years in the past till 65.5 million years in the past.
dinosaur: A time period which means horrible lizard. These reptiles emerged round 243 million years in the past. All descended from egg-laying reptiles often known as archosaurs. Their descendants ultimately cut up into two traces. For a lot of a long time, they’ve been distinguished by their hips. The lizard-hipped line are believed to have led to the saurischians, reminiscent of two-footed theropods like T. rex and the lumbering four-footed Apatosaurus. A second line of so-called bird-hipped, or ornithischian dinosaurs, seems to have led to a broadly differing group of animals that included the stegosaurs and duckbilled dinosaurs. Many massive dinosaurs died out round 66 million years in the past. However some saurischians lived on. They’re now the birds we see at the moment (and who’ve now developed that so-called “bird-hipped” pelvis).
extinct: An adjective that describes a species for which there are not any residing members.
fossil: Any preserved stays or traces of historic life. There are lots of various kinds of fossils: The bones and different physique elements of dinosaurs are known as “physique fossils.” Issues like footprints are known as “hint fossils.” Even specimens of dinosaur poop are fossils. The method of forming fossils known as fossilization.
geologic: An adjective that refers to issues which are associated to Earth’s bodily construction and substance, its historical past and the processes that act on it. Individuals who work on this subject are often known as geologists.
ichthyosaur: A kind of big marine reptile that appears much like a porpoise. It’s title means “fish lizard.” It was not associated to fish or marine mammals, nevertheless. And though not a dinosaur, it lived concurrently dinosaurs.
insect: A kind of arthropod that as an grownup can have six segmented legs and three physique elements: a head, thorax and stomach. There are tons of of 1000’s of bugs, which embody bees, beetles, flies and moths.
invertebrate: An animal missing a spine. About 90 % of animal species are invertebrates.
Jurassic: Lasting from about 200 million to 145.5 million years in the past, it’s the center interval of the Mesozoic Period. This was a time when dinosaurs had been the dominant type of life on land.
mammal: A warm-blooded animal distinguished by the possession of hair or fur, the secretion of milk by females for feeding their younger, and (sometimes) the bearing of reside younger.
membrane: A barrier which blocks the passage (or movement by means of) of some supplies relying on their measurement or different options. Membranes are an integral a part of filtration programs. Many serve that very same operate because the outer masking of cells or organs of a physique.
Mesozoic Period: An interval of geologic time from about 252 million to round 66 million years in the past. Typically known as the Age of Reptiles, this period consists of the Triassic, Jurassic and Cretaceous durations.
mosasaur: A kind of extinct marine reptile that lived concurrently dinosaurs.
penguin: A flightless black-and-white fowl native to the far Southern Hemisphere, particularly Antarctica and its close by islands.
plesiosaur: A kind of extinct marine reptile that lived concurrently dinosaurs and is famous for having a really lengthy neck.
reptile: Chilly-blooded vertebrate animals, whose pores and skin is roofed with scales or sexy plates. Snakes, turtles, lizards and alligators are all reptiles.
sea: An ocean (or area that’s a part of an ocean). In contrast to lakes and streams, seawater — or ocean water — is salty.
species: A gaggle of comparable organisms able to producing offspring that may survive and reproduce.