This is called analogous traits. When two different types of organisms are in the same type of environment, usually geographically separated, they come up with very similar adaptions to their local environment.
Because otherwise we wouldnt of found all of the stuff that is out there now such as planets and the moon
Back in 1970s leos were made of polyester or related fabrics, while now they are made of Lycra or spandex.
Because they don't need to. The operative term here is single celled...single celled organisms cannot survive if they specialize at the same level as a cell in a multicellular organism. Now it can breathe but it can't eat
A question may appear and you might know the answer to it. Now, I'm not saying it's important to learn everything, but learning\understanding some general knowledge is quite useful.
there are a large no of living things present in the world today. It is very difficult to study about each and every single one of them in one lifetime. Hence to make it easier, scientists classified organisms with similar characteristics into groups.
I was thinking the same thing. i think that its because when one group goes extinct the new major group thrives because somehow the now extinct group died off.
This question was asked in a similar way - and answered. See related link.
You appear to be very frusterated right now...
100000000000 BC to now.
The Demonstration Balance is Appear to Public Appointment is now Appear
In biogeography studies, similar animals that seem to be closely related are adapted to different environments in nearby areas. Also, in areas that are widely separated animals that seem to be unrelated are observed to have similar adaptations to similar environments in the separate areas.
Neither. Homologous structures are similar because two organisms came from a common ancestor. Analogous structures are similar because two unrelated organisms were subjected to similar environments. But the legs of a cat and the fins of a whale are not similar enough to be characterized as either homologous or analogous. The ancestors of whales were hoofed mammals, and one could argue that a hoofed mammal's leg and a cat's leg are homologous. However, after millions of years of being in the oceans, whales' fins have adapted such that they are now not at all similar to the legs of a cat.
They are appearing right now!
Dinosaurs are very related to birds and reptiles. One evidence that dinosaurs are related to birds is the dinosaur named Archeopthyx. At first, I really don't know the spelling of this dinosaur. But this dinosaur has feathers. It has a beak-like mouth and has sharp teeth.
You don't. They are not real, so they cannot appear anywhere. - Tirtha
Now, that we have come to the year 2011, no body can appear in 2009 no matter what.
phylogeny.