How was iron changed to steel ?

Heated and left to melt then harden again

Explanation:

Or it was smashed I think d 1st 1

Iron is changed into steel by blowing oxygen through the molten metal from the Blast Furnace. This oxidises the impurities in the molten metal. Carbon is a major impurity in Blast Furnace metal. Explain how blowing oxygen through the molten metal helps to remove the carbon.

d) the constitution rights of native americans and their right to self-government on reservations

1) the answer is b

senators serve a six-year term; representatives serve a two-year term, making them more responsive to (and responsible for) voter confidence.

2) the answer is d

to serve as president, one must:   -be a natural-born u.s. citizen of the united states;   be at least thirty-five years old;   be a resident in the united states for at least fourteen years.

3) the answer is a

ella,because it is constitutionally eligible

4) the answer is c: the u.s president