The decisions of Congress are heavily influenced by the power of the president. One example would be the power of veto. Even if Congress passes a law in both the House of Representatives and Senate, it does not become a law until the president officially signs it. If the president vetoes (overrules) this law, then Congress must be able to override this veto with a 2/3 vote in both the Senate and House. With this in mind, Congress must ensure before passing the law that if it is vetoed that they would have the power to still make this law possible.
As commander in chief, the president has significant power of the military. Even though Congress needs to approve a declaration of war, they must consider what policies the president will implement once the country is at war.
Answer:
The Constitution of the United States established America's national government and fundamental laws, and guaranteed certain basic rights for its citizens. It was signed on September 17, 1787, by delegates to the Constitutional Convention in Philadelphia.
3/C, the use of DDT is harmful to wildlife and has little effect on the spread of malaria (I think at least, it makes the most sense.)