Which type of protein, embedded in the plasma membrane, passively allows moclecules to move through the membrane

Channel proteins, also known as transport proteins, allow the passage of molecules in and out of the plasma membrane.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.