What causes genetic variation in a population? environmental changes
random mutations
favorable adaptations

Why is nh3 classified as a polar molecule

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?