TASK DEFINITION: In this task, you are given a sentence in the Spanish language. Your task is to translate the Spanish sentence into the English language.
PROBLEM: Son órganos linfoides primarios

SOLUTION: They are primary lymphoid organs

PROBLEM: En la β-oxidación de ácidos grasos de cadena impar, ¿cuál es la molécula que se forma con los tres últimos carbonos para entrar en el ciclo del ácido cítrico?

SOLUTION: In the β-oxidation of odd-chain fatty acids, what is the molecule that forms with the last three carbons to enter the citric acid cycle ?

PROBLEM: ¿Cuáles fueron los primeros autores que investigaron el papel que los eventos vitales estresantes podían tener sobre la salud?

SOLUTION:
Which were the first authors who investigated the role that stressful life events could have on health ?