Where does “escala” come from?

escala (Old Occitan) comes from Latin scala, from Latin scadla, from Latin scandere, from Latin scandō, from Proto-Indo-European sḱend- — to jump up, ascend.

Ancestry of “escala”, step by step

Step	Language	Word	Meaning
1	Latin	scala	ladder; stairs
2	Latin	scadla	—
3	Latin	scandere	third-person plural perfect active indicative of...
4	Latin	scandō	to climb, ascend, mount
5	Proto-Indo-European	sḱend-	to jump up, ascend

Every word from Proto-Indo-European sḱend- →Every word from Latin scandō →Every word from Latin scandere →