7. how do the president's power to recommend or veto legislation and to grant reprieves and pardons illustrate the principle of checks and balances?

The President exercises a check over Congress through his power to veto bills. The president also appoints judges with the Senate's advice and consent. He also has the power to issue pardons and reprieves, and as a Commander in Chief has the authority to command the U.S. armed forces.

When a president vetos a legislative branch, he is making sure the legislative branch is not being too unruly. The president also appoints Supreme Court justices which keeps the judicial branch in check.

Hope this helps :D

These islands/chinampas then provided rich soil for crops with easy access to water. i hope this is correct, im so sorry if its not !