Computer simulations are used to predict the weather. A computer simulation is a kind of model. Large amounts of data are entered into the computer. Then the computer performs complicated calculations with the data. The result is a prediction about what the weather might be like in the coming hours or days. Why are computers widely used for modeling weather systems?

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How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.

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