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In what ways amphibians are advanced than the fishes?

B) An electric heater is rated 1500 W. How much energy does it use in 10 hrs?

C) Write the electronic distribution for the element which has atomic number 20 and also write its valency.



Amphibians use lungs or gills both
they have three chambered heart and fish have two chambered heart
fish skin is covered with scales

2,8,8 2 and its valency is 2

time=10 hour
15 kwh
2 5 2
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