Roof lights, dormer windows or other roof extensions. Planning permission is not required provided that: 1. No part of the roof light, dormer or extension is higher than the highest part of the existing roof.
The answer & explanation for this question is given in the attachment below.
Answer:
The human heart contains an estimated 2–3 billion cardiac muscle cells, but these account for less than a third of the total cell number in the heart.
Explanation:
the human heart Structure. There are two types of cells within the heart: the cardiomyocytes and the cardiac pacemaker cells. Cardiomyocytes make up the atria (the chambers in which blood enters the heart) and the ventricles (the chambers where blood is collected and pumped out of the heart).
The right answer is the last one hope this helps your very welcome