What type of landform makes up most of middle america

Central America's Major Landforms. Central America is a land bridge, connecting North America and South America. This isthmus also separates the Pacific Ocean and the Caribbean Sea. The seven countries found in this part of the world are home to many beautiful landforms.

The Louisiana purchase

Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.