"The bases are both long" is the one structural problem among the following choices given in the question that prevents adenine from pairing with guanine. The correct option among all the options that are given in the question is the last option or the fourth option. I hope that this is the answer that has come to your help.
Answer:
in the wall of the right atrium of the heart.
Explanation:
The sinoatrial node (SA), consisting of spindle-shaped cells, initiates the electrical activity of the heart. From its location in the right atrium in proximity to the superior vena cava, the electrical activity spreads to the atria, whose cells are larger than those of the SA.
Ground Substance is the correct answer
The answer is true I’m just guessing