Alden is beginning to learn how to write. He can hold a pencil in one hand and steady the paper with his other hand. This new ability to coordinate the duties of his right and left hands is likely due to .

the growth of his corpus callosum

Explanation:

Alden is beginning of learning, and her coordination from right to left right is due to the growth of his corpus callosum. As the growth of his corpus callosum is responsible and made from fibers which play role to communicate two different sides of mind i-e right hemisphere and left hemisphere. corpus callosum is like message transmitter from one to another hemisphere.

False

Explanation:

America used canals and boat travel to move people and goods from the North to the South and vise-versa. Not from the East to the West. There were no large bodies of water, let alone rivers, to transport people and goods from the East to the West. This is why the idea of a transcontinental railroad was so attractive to America during the mid-19th century, after the invention of the steam engine. Railroads were fast and could conduct trade and transportation  much quicker than most boats could, so after being built, railroads were the main method of transportation from the East to the West, and much conflict would arise in the coming future because of this.