The answer is: the source of information could be biased
The scientist is interviewing environmentalists and then generalized their opinion as "people". An environmentalist is a person that cares about the environment, so they will more likely to deny the option that harms the environment. If the dam harmful to the environment, most environmentalists will not approve it.
Third option:
Sexually will reproduce more
Different genetics will have more adaptability
Answer:
if there is more exposure to uv radiation then skin color will be darker.
