Quiz 1: Cellular Respiration and Energy Which of the following statements about facilitated diffusion is true?
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Gated proteins control the rate of diffusion.
Molecules move up the concentration gradient
ATP is required to move molecules through the protein channels.
Molecules move from an area of low to high concentration.

compost can be added to topsoil as a:

pesticide

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.