2. which of the following was a product that came from the old world in the columbian exchange?
o a wheat
ob tomatoes
oc beans
od potatoes
3. which of the following accurately describes the treaty of tordesillas?
o a established a line of demarcation between territories controlled by portugal and those of spain
ob divided african lands up between the various european powers seeking trade advantages
oc put an end to the land battles between portugal and spain
od ended the violence between portuguese and muslim traders
4. which of the following drew hernan cortes to conquer the aztecs of mexico?
a christian beliefs
b rumors about gold
c the search for a northwest passage
d the promise of land to settle

2-potatoes

3-demarcation

4-Christian beliefs

Explanation:

1. ford: gerald ford´s presidency, from 1974 to 1977, faced high inflation, named it public enemy nº1, and created the win program (whip inflation now).

2. carter: president from 1977 to 1981, carter had controversial poitions over abortion, but yet, he enforce the roe vs wade decision, which had pro-choice content.

3. reagan. for his eloquency and powerful speeches in his mandates, from 1981 to 1989, reagan earned this nickname, “the great communicator” .

4. george h w bush: despite many presidents had important roles in managing and trying to end the cold war, it was in bush sr's mandate that the berlin wall was materially destroyed, and he was visited by gorbachev in the uspresident from 1989 to 1993.

5. clinton: defense of marriage act. clinton signed this controvesial act, which defined marriage and spouses in strict heterosexual perspective, that was later declard unconstitutional by the us supreme court.

6. george w bush: in the begining of his presidency, which lasted until 2009, bush jr faced the greatest terrorist attacks in us and probably the worlds history, in september, 11 of 2001.

7. obama: in attempts to cease a great economical crisis, barack obama signed the controversial recovery act in february 2009, which handled 780-billion dollars.

a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?