The region in the urinary bladder, defined by the openings of the ureters and the urethra, is called the

The answer in the space provided is trigone. This could be identified with its appearance of having to show a smooth triangular region in which is found on the internal part of the urinary bladder. This is likely to be formed because of the internal urethral orifice and the two ureteric orifices. 

the answer is d (apex) good luck : ))

eukarya because is is like alche and b is bacteria and d is animals

explanation: