Obsessive-compulsive disorder (OCD): A. does not seem to have a genetic component because it does not run in families. B. is characterized by a nonfunctioning limbic system. C. sometimes occurs during a period of life stress. D. is found in people with high levels of serotonin in their brain pathways.

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

hope this

i am brianly

sorry if this doesn't

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.