Which internal structure is an adaptation that provided organisms with the function to perform a gas exchange on land? Lungs

4- chambered heart

Hollow bones

Gills

The answer is b on plato.

The answer is c. 320 g

Ido not understand. 

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy