A vein. This is because veins carry deoxygenated blood back to the heart.
I think the answer is D
as A would mean that the abyssopelagic organisms would be best adapted and therefore a large biomass which isn't the case and it isn't B nor C so it must be D
Hope that helps
<span>The correct answer is cGMP.</span>
<span>cGMP, during the dark (when there are no stimulations of photoreceptor cells), reaches high intracellular levels. When the light stimulation occurs cGMP levels decrease because it is converted to GMP by phosphodiesterase. Phosphodiesterase is activated by transducin which is activated by excited rhodopsin (contains photopigment).</span>
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Low levels of cGMP block the cGMP gated ion channels and that prevents the entry of Na and Ca. Because of that membranes becomes more negative, hyperpolarization occurs and this creates a signal for the next cell.</span>
Taking bird's nest, cutting trees and hunting / poaching animals for game.
The answer is amniotic fluid.
