Concordance = presence of the same trait. 
Identical twins have a higher rate than fraternal because most of their DNA is identical, it’s identical because the zygote split into two so the babies shared an amniotic sack. (Zygote is fertilized egg) so the baby got duplicated meaning only one egg and sperm created two babies. Fraternal twins happen when two eggs are fertilized and grow in separate amniotic sacks. So two different babies, two different eggs and sperm.
        
             
        
        
        
Hey there!
This is in contrast to physiology<span>, which deals primarily with function. </span>Morphology<span> is a branch of life science dealing with the study of gross structure of an organism or taxon and its component parts.</span>
        
             
        
        
        
I would say within the space C
(A) cells are the transitional epithelium cells, there resist to the acidity of the urine. It protects smooth muscle cells (B) responsible for the bladder contraction and the release of the urine by the urethra.
the C space represents the intern cavity of the bladder where the urine is supposed to be stored waiting for the micturition (urination).