Fill in the blanks :
(i) Annelids have......and insects have........for excretion.
(ii) Organisms that show changes in the concentration of body fluids according to the concentration of surrounding medium are called......and those which maintain an internal osmolarity different from the surrounding medium in which they live are called...... .
(iii) Sharks and coelacanths reduce the osmoregulatory challenges by retaining..........and.........respectively in their body fluids making them slightly hypertonic to sea water.
(iv) In earthworm, depending upon their position, septal nephridia are........and pharyngeal nephridia are.......... .
(v) Blood enters the glomerulus via..........arteriole acid leaves via....arteriole.

Explanation

(i) Nephridia, malpighian tubules (ii) Osmoconformers, osmoregulators
(iii) urea, trimethylamine oxide (iv) Enteronephric, ectonephric
(v) Afferent, efferent.