What enables hydroelectric power plants to keep up with spikes in demand for electricity?
O a
Ob
generators that are controlled
Dams that open and close
stations that can be turned off and on
all of the above

What is limiting reactant? with examples

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?