Juan has been part of a postoperative cardiac exercise program since suffering a major heart attack six months ago. Although he no longer needs to attend, he continues to participate in the program because he enjoys the friendships he developed with other program participants. Juan's participation reflects which psychological benefit of physical activity

Mr. mann's science students were experimenting with speed. they set up a 1 meter (100 cm) track. the students used balls instead of cars. the balls were different sizes and made of different materials. four at a time, students rolled balls around the track to see which had the fastest and slowest speeds. some of their data are shown in the table. which ball will take the longest to complete one lap around the track?

What was different about warfare in the early 1800s and early 1900s?

Fallon is on her way to work when she sees a little boy, who is crying and apparently lost. seeing the crying boy makes fallon very uncomfortable and upset. to reduce these negative feelings, fallon stops to the boy find his parents. which theory best explains fallon's behavior?