Some teenagers or an individual addicted to the drug, smoking in under age. Some other risky behavior is skipping school, stealing money which makes people uncomfortable in social life. Risky behavior can cause anxiety, mental stress and unhappiness in the people.
The most important producer in both freshwater and marine ecosystems is phytoplankton.
B. relied heavily on the concept of natural selection is my best bet
When Joseph sees a frail man limping around the corner he owns, he will likely help if the costs of helping are small and Joseph will feel better about himself helping.
Helping someone in need corresponds to a form of empathy and altruism, which is based on the moral emotions we feel when we see a person in a situation that we have the ability to help.
According to the theory of social exchange, altruism only exists if the benefits to the helper outweigh the cost, so supported by this theory, the letter b is correct, and Joseph will help the man if the costs of helping are small.
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