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(D) . Urinary bladder is generally absent in most fishes (except some lungfishes).$b$. $Gambusia$ is a larvivorous fish that feeds on mosquito larvae

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$a, b, c$ and $d$

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(D) . Urinary bladder is generally absent in most fishes (except some lungfishes).$b$. $Gambusia$ is a larvivorous fish that feeds on mosquito larvae and is used for biological control of malaria.$c$. Ampullae of Lorenzini in dogfish $(Scoliodon)$ are electroreceptors,but they also function as thermoreceptors to detect temperature changes.$d$. Electric organs found in fishes like $Torpedo$ are modified muscle tissues.Since all the given statements are scientifically correct,the correct option is $d$.

Column $I$	Column $II$
$A$. Aptenodytes	$p$. Aves
$B$. Hemidactylus	$s$. Reptilia
$C$. Carcharodon	$q$. Chondrichthyes
$D$. Pteropus	$r$. Mammalia

Read the following statements and find out the correct statement.
$a$. Urinary bladder is absent in fishes
$b$. Gambusia fish eradicates mosquito larva
$c$. Ampulla of Lorenzini present in dogfish act as thermoreceptors
$d$. Electric organs are modified muscles

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Read the following statements and find out the correct statement.$a$. Urinary bladder is absent in fishes$b$. Gambusia fish eradicates mosquito larva$c$. Ampulla of Lorenzini present in dogfish act as thermoreceptors$d$. Electric organs are modified muscles