Urine is transported to the bladder:
a. from the medulla of the kidney to the renal cortex.
b. by peristaltic contractions of the ureters.
c. only after relaxation of the internal sphincter.
d. by contraction of the renal capsule.

The correct option is: b.  by peristaltic contractions of the ureters.

Explanation:

Ureters are the long tubes that connects each kidney to the urinary bladder.

The urine is passed into the ureters from the kidneys and then the muscles present in the walls of the ureters contract and pass the urine into the bladder. This process is called peristalsis.

Therefore, the urine is transported to the bladder by the peristaltic contractions of the ureters.

answer: no, they are not.*

although rubber bands that contain excessive amounts of dye, toxins, or additives are sometimes toxic, most rubber bands do not cause any health issues. since they are typically made of latex, (a natural substance that is extracted from trees) they are not dangerous in any way if you chew them or accidentally ingest a piece of rubber band. however, chewing rubber bands does pose a choking hazard and is not a good habit to have.

*depending on the type of rubber band. the typical rubber bands that you see at stores are not toxic, but other types of rubber or latex that contains certain chemicals may be unhealthy and hazardous.