What is the monroe doctrine and why is this important to u. s history? how did the world react?

Explanation:

he Monroe Doctrine was a United States policy of opposing European colonialism in The Americas beginning in 1823. It stated that further efforts by European nations to take control of any independent state in North or South America would be viewed as "the manifestation of an unfriendly disposition toward the United States."

the answer is actually b.   as habitats are destroyed, animals and plants may become extinct.   , according to edge nuity