Question

Urinary Bladder is absent in ________.
A. Fishes
B. Snakes
C. Crocodiles
D. All of the above

Answer 1

A hollow muscular organ is the urinary bladder, or just the bladder. It stores urine from the kidneys by urination before disposal. The urinary bladder acts to postpone the pace of urination as a storage vessel for urine.

Complete answer:
By a complex, high energy-demanding process, birds, reptiles and desert dwelling animals excrete uric acid as a semi-solid material in their gut excrement. Yet this has the benefit of storing much-needed water.
In fish, rodents, and crocodiles, the urinary bladder is missing. Since their urine is semi-solid it is composed mainly of uric acid. In humans and other vertebrates, the urinary bladder, or simply the bladder, is a hollow muscular organ that stores urine from the kidneys prior to urination. A thin muscular and distensible organ located on humans' pelvic floor is the bladder.
Owing to discharge from two ureters, urine, excreted by the kidneys, gathers in the bladder prior to disposal by urination (micturition). Urine, a single muscular tube that ends in an opening called the urinary meatus, where it exits the body, exits the bladder through the urethra.
So, the correct answer is “Option D”.

Note:
In the kidneys, urine is formed and passes to the bladder down two tubes called ureters. The bladder stores urine, so that urination is rare and regulated. The bladder muscles squeeze during urination, and two sphincters (valves) open to allow urine to flow out. Urine flows into the urethra from the bladder, which takes urine out of the body. The bladder's usual capacity is 400-600 mL.