Blood is best classified as connective tissue because
a) its cells can move from place to place
b) it contains more than one type of cell
c) its cells are separated from each other by an extracellular matrix
d) it is found within all the organs of the body

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.