What had to happen in Panama before the canal could be built?

What is the supreme law of the land? the declaration of independence the federalist papers the articles of confederation the constitution

When there are advances in technology, such as the personal computer, how might business productivity change? a) productivity is separate from technological advances so there is no impact. the new technology can replace outdated, less efficient, machinery. o) the businesses' products will no longer be demanded. d) manufactured items will be made elsewhere.

Why do many scientists suppose the land bridge theory of migration?