In a circult, a battery is used to

1. slow down current
2. conduct current
3. raise the potential of electrons
4. convert electrical energy into some other form of energy

4. convert electrical energy into some other form of energy

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures