to visit its world-famous cities
Gamma ray photons carry more energy than photons of any other wavelength.
You can't actually use the illustration to answer the question, because it doesn't say anything anywhere about energy. Still, i'm glad that you did include the illustration, and that i was able to see it, and now I can give you even more help: The illustration has several problems and outright errors. Don't spend too much time trying to learn stuff from it.
Answer:
The answer is Puberty
Explanation:
When humans reach Puberty, their bodies begin to develop further and change. In men, this can be seen by the growth of pubic hair, enlarged testicles, a deeper voice and the production of sperms.
In girls, this can usually results in growth of pubic hair, widening of the hips and monthly cycles of menstruation.
Once humans go through his process, they are capable of sexual reproduction. Men can product semen while women can produce fertile eggs that can result in pregnancies.
