An ecosystem is made of? biotic factors, abiotic factors, both biotic and abiotic factors.

Describe five factors that influence the value of fuel

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.

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous