What are the pairs i need them before i can try to answer
A- valve replacement
b- stents
x- heart transplant
In semiconservative DNA replication, each new double helix that will form will have 1 polynucleotide strand that is from the old DNA molecule and is an Old or Parent strand, and will have a polynucleotide strand from the newly synthesized one, the new DNA strand.
The answer is Vestigal. It is a type of anatomical structure that no longer serves any function.
Explanation:
Smooth muscle can be found in the walls of hollow organs and passageways, they can contract and they have fibers of actin and myosin tuning though it arranged in an staircase form.
In the images I added you can see how smooth muscle looks when observed in a microscope, wider in the middle and elongated at the ends, and the staircase arrangement.
I hope you find this information useful and interesting! Good luck!