Section II: True/False (1 mark each)
1.
Aquatic pyramids of biomass tend to be inverted,

showing a photograph would make this a hell of alot easier

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

b is the correct answer