According to the biological classification,which of the following groups is correct?

  • A
    Ascaris,Pheretima,Grasshopper
  • B
    Hydra,Pteris,Leucosolenia
  • C
    Starfish,Grasshopper,Solen
  • D
    Pila,Dentalium,Octopus

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Sponges and coelenterates resemble each other in being

$A$ mature Hydra usually bears

Which of the following snakes is not poisonous?

Match the following columns:
Column-$I$Column-$II$
$(a)$ Amphibia$(1)$ Air bladder
$(b)$ Mammalia$(2)$ Cartilaginous notochord
$(c)$ Chondrichthyes$(3)$ Mammary gland
$(d)$ Osteichthyes$(4)$ Pneumatic bones
$(e)$ Cyclostomata$(5)$ Dual habitat
$(f)$ Aves$(6)$ Jawless,circular,sucking mouth

Assertion $A$: Fishes possess gills,fins,and scales.
Reason $R$: Fishes are a form of taxon.
Which option is correct for Assertion $A$ and Reason $R$?

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