No evidence exists for "alternate dimensions." If they DID exist, no known theoretical framework exists in which acceleration would cause matter in our dimension to go to the other one simply acceleration. In our Universe, acceleration greater than a certain level would cause the death of organic matter. This fatal level has been achieved with death occuring, but no disappearance of the organism -- it simply dies.
The idea you suggest is pure fiction, on the same level as magic gremlims.
An extinction.
Comparative embroyology allows us to see the similarities between embryo's of related species. Therefore, similarities between two organism's in the embryo signal that at some point, those two organism's were related. The earlier those similarities disappear, the farther apart evolutionarily the two organisms are.
An organism.
An organism that lives in another organism can kill it. At times this organism can live quite awhile in another organism.
what happened to the energy that is not stored in your body
An extinction.
An individual organism does not lose characteristics. A species can, over time, and this is called natural selection, which thus results in evolution.
Fleas
a polar bear because if it gets warm then his fur will make him overheat and die
No because if one person does not reproduce the whole population will not just disappear. There are many people who never reproduce and many people who do. But all in all, it is not essential for ONE organism to reproduce.
Well... Think about it. In the first dimension, a person would just be a line. In the second, they would 2D, like a square or a triangle. Human beings are 3D, so I guess in the fourth dimension, they would be fuller. Like a rectangular prism, except with more sides, eyes, a mouth, a nose, and stuff like that.
Comparative embroyology allows us to see the similarities between embryo's of related species. Therefore, similarities between two organism's in the embryo signal that at some point, those two organism's were related. The earlier those similarities disappear, the farther apart evolutionarily the two organisms are.
An organism.
An ecosystem.
An organism that lives in another organism can kill it. At times this organism can live quite awhile in another organism.
A living organism
An organism that eats another organism is called a consumer.