What do climatologist study about fossil seashells in rock sediments to learn about climate? the ratio of magnesium to calcium in the shells
the chemical traces of alkenones
the shapes of the shells
the strontium content

Which numberline shows the solution to n -3

What could the united states of america do to improve their status? name at least 3(ap human geography)

The us and canadian governments are doing all of the following to combat environmental problems except a. encouraging the use of public transportation b. enacting clean water policies c. requiring emissions testing d. limiting animal populations in some regions