S 1. Explique pourquoi deux espèces différentes ne peuvent pas occuper la même
niche écologique.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

the answer is d p: cell, q: organ, r: organ system, s: tissue

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added