Recall that in the northern hemisphere, atmospheric co2 levels are highest in early spring and lowest in early fall. what accounts for this seasonal fluctuation in atmospheric co2 levels? 1 photosynthesis2 human activities3 respiration4 biomineralization5 plate tectonics

1. Photosynthesis

Explanation:

In the northern hemisphere, atmospheric levels of carbon dioxide gas are maximum during late winters and spring months. The increased carbon dioxide levels of atmosphere are due to lowest vegetative uptake of the gas by plants for photosynthesis.

On the other hand, early autumn months in the hemisphere exhibit low carbon dioxide levels. This is due to the increased photosynthetic activity of native plants during the month of summers which in turn reduces the concentration of carbon dioxide in air.

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.