According to the ancients, the stars traveled around Earth on the transparent, hollow a. equatorial plane C. solar orb
b. celestial sphere d. ellipse

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.

c. is the correct answer

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.