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(D) The size of an egg is generally related to the size of the organism, but there are exceptions. Among the given options, the American toad $(Anaxyr

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American toad

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(D) The size of an egg is generally related to the size of the organism, but there are exceptions. Among the given options, the American toad $(Anaxyrus 	ext{ } americanus)$ produces eggs that are extremely small, typically measuring about $1 	ext{ } mm$ to $1.5 	ext{ } mm$ in diameter. While hummingbirds are small birds, their eggs are significantly larger than those of the American toad. Salmon eggs are also larger, and blue whales are mammals that do not lay eggs.

Column-$I$	Column-$II$
$(A)$ Fish	$(i)$ Two atria and one ventricle
$(B)$ Frog	$(ii)$ One atrium and one ventricle
$(C)$ Snake	$(iii)$ Two atria and two ventricles
$(D)$ Ostrich	$(iv)$ Two atria and incompletely divided ventricle

Column-$I$	Column-$II$
$(a)$ Contractile vacuole	$(i)$ Excretory unit
$(b)$ Parapodia	$(ii)$ Food ingestion
$(c)$ Flame cells	$(iii)$ Locomotion
$(d)$ Nematocysts	$(iv)$ Osmoregulation

Among the following animals, which one produces the smallest egg?

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Match the following columns:
Column-$I$ Column-$II$
$(a)$ Contractile vacuole $(i)$ Excretory unit
$(b)$ Parapodia $(ii)$ Food ingestion
$(c)$ Flame cells $(iii)$ Locomotion
$(d)$ Nematocysts $(iv)$ Osmoregulation

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