Answer:
1) fractional distillation
3) centrifugation
Answer:
The scientific method is a method of research in which a problem is identified, relevant data are gathered. Also hypothesis is made from this data, and the hypothesis is empirically tested.
Explanation:
Answer: c 3
Explanation: Nitrogen I forgot the other one I think hydrogen and oxygen hope this helps!
A.) Nucleotide base
Why? Because there are four different ones, A, T, C, G
