¿Qué cambios ocurrieron en el medio ambiente que llevaron a la evolución de un ojo complejo a partir de una versión más simple? ¿Para qué sirvió?

The transport tubes for food coming down the plants are called?

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.

Which particle controls what element an atom is?