I would agree with you - the conclusion should leave readers with an important thought at the end.
This thought should never be new, or opposing to the previous ideas you had been writing before. It also shouldn't be confusing, but quite conversely - it should explain everything and put everything in place.
The new sentence, Lion cubs are born with spots, but they lose their spots by the third month, is an example of a COMPOUND VERB.
Compound verb are verbs used in a sentence by a single subject.
The subject in the sentence is LION CUBS.
The compound verbs in the sentence are ARE BORN and LOSE.
10.) A light from the shadows shall spring
Tom conscientiously did his homework ,but was surprised when the best student asked to beseech it.