The rungs of the DNA ladder are made of:

1) Glucose and sugars

2) Base pairs

3) Phosphates and hydrogen

4) Sugars and phosphates

2. Base Pairs

Explanation:

The rungs of DNA are made up of nitrogenous bases: adenine, thymine, guanine and cytosine. Adenine pairs with thymine, and cytosine pairs with guanine.

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1.the evidene of the reaction

2.yes

3.yes

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.