"Computers and the internet have revolutionized modern communications." is that a action or linking verb

Read the passage from an argumentative essay. many endangered species are currently threatened by climate change. there are some laws already in place, but are they effective enough? anyone with a conscience knows that these creatures deserve the chance to survive without outside threats impeding their survival. i suppose this is a tough decision for lawmakers, but i hope they choose wisely. which statement best evaluates the claim in the passage?

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What happens to lovers when there are decreased levels of serotonin in the brain?