I need the answer pls help its in scince

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above

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.

How does the color of light affect the germination time (amount time a plant takes to develop) of a radish seed?