Yes, A is correct. Taking a shower is not an automatic bodily function
In bone growth, the medullary cavity is enlarged because of the activity of osteoclasts. These are cells working to break down bone, resorbing old bones which will line in the medullary cavity. The cavity is also enlarge as the cells contribute to the increase in length and diameter of a growing bone.
Nope they donot instead they have plasmids and chromosomal
