Answer:
determining the optimum resting heart rate
Answer:
D. external influences
Explanation:
Outside sources such as friends and social media can all be examples of peer pressure. This is when the people and things around you influence your opinions and actions about topics.
Peer pressure and the examples listed in the question are external influences. As stated previously, these sources can influence your actions. Additionally, they are all considered external because they come from outside of a person's own mind and ideas. Any outside source that affects one's decisions is an example of an external influence.
Answer:
Morphine and other opioid drugs
