Question

¿qué significan estas palabras?
ascienden \tselect...
descienden \tthey ascend (go up)
\t\tthey descend (go down)
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Explanation:

For "ascienden", we analyze the root "ascender" (to ascend) and the verb conjugation (third - person plural present indicative). So it means "they ascend (go up)". For "descienden", from the root "descender" (to descend) and the same conjugation type, it means "they descend (go down)".

Answer:

ascienden: they ascend (go up)
descienden: they descend (go down)