Which of these is different for all the groups being tested in an experiment ? a hypothesis b constant c control d variable

What does the cell nucleus do or, how does it function?

Which of the following statements about hybrid orbitals is or are true? choose all that apply. choose all that apply. under sp2 hybridization, the large lobes point to the vertices of an equilateral triangle. after an atom undergoes sp hybridization there is one unhybridized p orbital on the atom. the angle between the large lobes of sp3 hybrids is 109.5∘

Why is the melting of ice a physical change ?