The answer would be TRUE because going through puberty/teenage years can be early in life like for 12 year olds, or normal time, and even in young adult hood because people's bodies are different so we change at different times, not at the same time.
it pumps blood? but depending on which part of the heart it is located it could be oxygenated or deoxygenated blood
True because certain people have health issues that stops them from doing certain sports/stuff.