Answer:
During transcription, only one strand of DNA is usually copied. This is called the template strand, and the RNA molecules produced are single-stranded messenger RNAs (mRNAs). The DNA strand that would correspond to the mRNA is called the coding or sense strand
Explanation:
Vein because they have valves to prevent back flow of blood.
A tentative explanation of a phenomenon that can be tested I believe is a scientific experiment.
Answer: A
Explanation: the taking the quiz
