Answer:
The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders.
Explanation:
No, it is unethical to use another author's ideas without crediting his or her work or literature. Failing to credit an author's work in your own work is known as plagiarism. Plagiarism has serious and sometimes even legal consequences in both educational institutions and beyond that in the corporate world and publishing industries. To avoid plagiarism and remain ethical it is best to quote ideas given by another author and clearly state the source from which you are quoting the author's work.
The answer is systematic and reject. If you follow your intuition, you will more often than not err by misclassifying a random event as systematic. We are far too willing to reject the belief that much of what we see in life is random.
