When it is summer in sydney, australia what season is it in montreal, canada? explain your reasoning.

it is winter

Explanation:

It is winter in canada because theyre on opposite sides of the globe

Controls the movement of substances in and out of cells and organelles.
they keep toxic substances out of the cell; also they contain receptors they also channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass
Hope this helps!