Answer:
Higher pressure in glomerular capillaries than in the surrounding Bowman's capsule.
Explanation:
The renal corpuscle is composed of the capillary glomerulus and the Bowman's capsule that covers it, there is a space inside the capsule, Bowman's space, where the filtered liquid from the glomerulus passes. The glomerular pressure must be higher than in the surrounding Bowman's capsule, so in that way it forces the filtration and tends to expel fluid from the glomeruli, allowing the passage of water, small molecules of solute and ions.
I believe the answer you're looking for is photosynthesis, where plants release oxygen and humans use this to release carbon dioxide to the plants.
C. Because ecosystems consist more of animals
It is an important natural resource because it helps plants to grow and without plants we have nothing to eat and no air.