Which of the following is the best reason for using a scanning electron microscope?
a. ability to magnify objects that are larger than 0.2 micrometers
b. ability to observe live organisms
c. ability to see three-dimensional images of the surfaces of objects
d. ability to see movement within living cells

Which phrase describes the paleo-indians of prehistoric arkansas? a. grew cornb. lived in cliff dwellings c. crafted beautiful potteryd. hunted with stone-tipped spearswhich phrase describes native arkansas from the woodland traditiona. developed widespread agricultureb. hunted mastodon and woolly mammothc.built rectangle-shaped homesd. traded salt with other groups