Ancient horses had less mass than present-day horses. the mass of the present-day horse is about 500 kilograms. what is the correct order of evolution of the horse starting from the youngest fossil? a: a c d bb: b d c ac: d a c bd: b c a d

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.