The optic nerve needs a minimum of 2.00 x 10−17 J of energy to trigger a series of impulses that eventually reach the brain. How many photons of this wavelength, 6.8 LaTeX: \mu mμ m, are needed? Enter to 3 sig figs.

explanation:

i'd say that the moon rock is about 2.2 billion years old.

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.