Answer:
Positive transfer
Explanation:
According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question this phenomenon is best explained by Positive transfer. This term refers to the improvement of already attained knowledge through the gain of new additional education. Which is what is happening when you found out that set of knowledge (spanish) helped you learn another different yet related set of knowledge (french).
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.