Answer:
Population
Explanation:
Because they make a percentage of all dogs
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The author may have presented that the development of personality is complex, showing how there are many elements acting in this development and countless elements that can modify this development at any time. To illustrate this, the author can make a comparison between personality development and a complex system, such as the development of a plant or an embryo for example.
Answer: The author wants to say that we should not take our physical activity away from our study because it is very important to us and those who do physical activities are better at studies than those who do not take part(participate) in extracurricular activities.
