Find out the, mass of 10^21 molecules of cu​

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

Which states of matter have particles that move independently of one another with very little attraction?

Can anyone answer these questions? ? i need it before 1: 00pm today