Root nodules are associations between bacteria and plant roots responsible for

In which of these cases are the two wave points considered to be in phase with each other?

What is the atomic number of an atom that has 6 protons

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium