The worlds population is distrubted on earths surface by

The difference(s) between the grand canyon and valles marineris is/are: (a) the grand canyon was formed by water, but valles marineris was not. (a) valles marineris is much longer than the grand canyon. (c) valles marineris is much wider than the grand canyon. (d) valles marineris has large volcanoes near it. all of the above

Distance that lewis and clark traveled from st. louis to ft. clatsop near the pacific ocean.

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d