The kidney of an adult rabbit is .............

$I.$ Ureter,$II.$ Renal pelvis,$III.$ Calyx,$IV.$ Urinary bladder,$V.$ Urethra. Choose the correct sequence of the urine route to the outside.

In which of the following is the minimum content of urea present?

Human kidney has

Which of the following is not a part of a kidney?

Select the correct statements from the following.
$(i)$ Renal papilla is a narrow tip of the medullary pyramid.
(ii) Renal cortex is red-coloured and striated.
(iii) Longitudinal-circular-longitudinal arrangement of smooth muscles is observed in the renal pelvis at its origin.
(iv) Ureter is a long,non-muscular hollow tube that communicates with the renal pelvis at its origin.