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Trilobites existed in the Devonian period, but they were not exclusive to it. They were abundant before the period and continued to exist afterward, though in much less abundance.
A chemical reaction for this process doesn't exist.
I think that reproduction is important to organisms because this is the way to keep the population going. If there is not enough reproduction, the plant or animal may become endangered or even extinct. So basically reproduction is important to living things because without it, that organism wouldn't live.
This change of phase doesn't exist; probable you think to a chemical reaction in gaseous phase.
no because molecules need to be able to travel into the cell. the smaller the cell the more efficient this process is.
sorry, no.
1965
Do not exist.
It differs in each Generation. See Related link for each Generation. Note that Lugia didn't exist in Generation I
It doesn't exist in the third generation.
No because generation 5 Pokemon don't exist in 4th gen.
No. Riolu did not exist during Generation III, which was the generation Pokemon FireRed & LeafGreen versions were set in.
The Ancient Egyptians believed that the soul continued to exist after death. However, the soul could only exist if it has an earthly anchor. That anchor is the body of the deceased. If the body was destroyed, the soul would die. So to combat decay, the Egyptians mummified the bodies.
Extinct usually means that no more individuals of the species that are capable of reproducing are still alive. If there are any individuals of the extinct species still alive, since they cannot reproduce for some reason, they are the last generation.
No way. It didn't exist in that generation.
The regi's didn't exist in Generation 2 games. They were introduced in generation 3, namely ruby, sapphire, and emerald.
Togekiss is a Generation 4 Pokemon, so it's impossible. (That and the Shiny Stone doesn't exist before that Generation.)