The superior and inferior vena cava the largest in the body.
a
arteries
b
arterioles
с
capillaries
d
venules
e
veins

b.

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 c. altitude. hope this ! #brainiac