though he may drive carefully, there is still a danger accident in a fog so dense -> However

These two elements threaten ecosystem biodiversity.

Langston hughes's poem "madam and the rent man" reflects its historical setting because madam's apartment is in a serious state of disrepair and the landlord will not fix it. madam is at the mercy of a rent man who does not care and takes advantage of her. madam's words show her frustration about being treated unfairly and her determination to fight for what is right. madam does not feel that she has the power to stand up for herself when confronted by the rent man.

What is the hardest language to learn?