A wolf pack may have as many as twenty wolves. By three weeks of age, wolf pups are able to play. Most packs are led by an adult male and adult female. The average size of the wolf litter is around four pups. What type of evidence does the author use to develop an argument? Facts, testimonials, statistics, expert opinions

The author primarily utilizes facts to develop their argument. They state specific details such as the maximum number of wolves in a pack, the age at which wolf pups can play, the leadership structure of most packs, and the average size of wolf litters. These facts provide evidence to support the author's statements about wolf packs.

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Based on the information given, the author uses facts to develop an argument. Facts are statements that can be proven or demonstrated to be true. In this case, the author presents information about the characteristics and behavior of wolf packs, such as the maximum number of wolves in a pack, the age at which wolf pups are able to play, the leadership structure of wolf packs, and the average size of wolf litters.

Testimonials refer to statements or anecdotes given by individuals about their personal experiences. The information provided does not include any personal accounts or experiences of individuals, so testimonials are not used as evidence.

Statistics involve numerical data collected and analyzed from a larger population. While there is mention of the average size of a wolf litter (four pups), there is no statistical data provided to support this claim. Therefore, statistics are not used as evidence.

Expert opinions are viewpoints or statements provided by individuals who are considered authorities or specialists in a particular field. There is no mention of any expert opinions in the information given. Therefore, expert opinions are not used as evidence.

In this case, the author primarily relies on facts to support their argument.