Answers

2015-01-04T12:39:45+05:30
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

1500w=1.5kw
time=10 hour
energy=powerXtime
=1.5X10
15 kwh
2 5 2