True or false.
Both calcium's atomic mass and it's mass number have units of measurement.

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table