Why do histone genes have a very slow molecular clock?

The transport tubes from food came down the plant are called?

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?

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.