Is it permissible to complete the study of biology and teach it, given that some courses address Darwin's theory, and is it permissible to teach biology in schools while being prepared to explain the invalidity of Darwin's theory to students if it is included in future curricula?

There is no objection to completing a biology degree and teaching it, even if it includes an erroneous theory, provided that the invalidity of this theory is explained to the students. The study of biology is among the beneficial sciences that help one reflect on God's creation, His greatness, His power, and His knowledge.