Does the Yaris' engine have a timing chain or belt?

[Pars]

If they can make a belt to replace the transmission, how hard can it be to make one that's as durable as a timing chain?

Since I had to change the timing belt 2 times on my old Honda before I sold it, I'm glad I don't have to worry about timing belt changes. I wasted $1500 on the belt replacement, simply because the manufacture couldn't rely on their product and I had pay expense.