In a deoxyribonucleotide, what chemical group is found at the 2' carbon of the sugar component? an amino group
a hydroxyl group
an oxygen
a hydrogen
one or more phosphate groups

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.

maybe because its impossible for balloons to lift a whole entire house.

lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. so they expose rocks