Which of the following is true of an effective scientific model?

A.)It seldom needs refining because of its detailed accuracy.
B.)It clearly depicts the particular set of characteristics being modeled.
C.)It is an exact visual representation of the characteristics being modeled.
D.)It is the same size and color as the scientific phenomena being demonstrated.

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!