The purines have two rings in their structure while the pyrimidines have hust one
Answer:
Explanation:
To differentiate:
Solution:
Use product rule: and the following formulae:
Use
True. A manipulated variable is the independent variable in an experiment. It's called “manipulated” because it's the one you can change. ... The manipulated or independent variable is the one that you control. The controlled variable is the one that you keep constant.
A exist naturally because I don't know I figured it out you're welcome