$A$ fresh water fish maintains osmoregulation by

  • A
    Continuously taking in water and eliminating excess of salts
  • B
    Eliminating excess of water and taking up salts from the environment
  • C
    Taking both water and salt from the environment
  • D
    Eliminating both salt and water into the environment

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Antennal glands are found as an excretory structure in:

Excretory organs of different animals are given below. Match the animals with their respective excretory organs.
AnimalExcretory organ/Unit
$(a)$ Balanoglossus$(1)$ Metanephridia
$(b)$ Leech$(2)$ Nephridia
$(c)$ Locust$(3)$ Flame cells
$(d)$ Liver fluke$(4)$ Absent
$(e)$ Sea urchin$(5)$ Malpighian tubule
$(f)$ Pila$(6)$ Proboscis gland

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