What are our chances of staying under that threshold in the power sector? (back your answer up with numbers.)

they come from the collision of two stars.

Explanation:

answer; i believe the correct answer is (sporophyte);

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.