Which is a compound?
a. iodine.
b. water.
c. calcium.
d. air.

How does the atmosphere to make earth livable? check all that apply. causes the seasons contains oxygen provides warmth creates important nutrients blocks harmful energy from the sun plz like !

Which liquid (h2o, h2o + soap, or h2o + salt) has the strongest cohesion and adhesion? (need now plz)

Nuclear decay is the spontaneous decay of one element into a. an x-ray b. a ray of light c. another element