How did improving treatment of patients with antibiotics lead to a new problem?
antibiotics began to cause habitat destruction.
some food sources were contaminated by antibiotics.
some pathogens became resistant to antibiotics.
antibiotics began to interfere with the treatment of inherited diseases.

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According to erikson, a teenager’s challenge is the search for

Andrew feels good about himself. he doesn't know exactly why he is so happy, but every day he looks forward to his schoolwork and chores. "i play a game," he says. "i make a list of everything i have to get done, and then i try to finish it all before a certain time. for some reason, i feel great when i beat my time." based on this information, why is andrew happy? he gets a proper amount of sleep he eats healthy meals he has a strong family support group he regularly meets his own goals