The evolutionary advantage of meiosis can be best explained by which of these statements?

What does the word submerged mean in the following sentence? after it rained for three days in a row, the streets were completely submerged.

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

Combine like terms. do not forget to use the distributive property to simplify the first term. 2(3y + 5k) - 2k