Which of the following statements is correct.

The ureter carries urine from the kidney down to the bladder.

The ureter carries urine from the blood down to the kidney

The ureter carries urine from the bladder down to the external opening

The ureter carries urine from the body down to the external opening

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

the glands which are associated with each description is given below: