Why does a helicopter have a tail rotor? 1. the tail rotor is just for decoration. 2. none of these 3. this increases safety if any of the rotors breaks down. 4. this keeps the helicopter from spinning out of control?

What makes a dominant allele different from a recessive allele

What is the problem in this article? what solution does the article propose?

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.