Which statement about human blood vessels is correct?

a. veins transport blood from the heart to the capillaries.

b. arteries carry blood toward the atria of the heart.

c. the pulmonary artery carries oxygen-rich blood from the lungs.

d. pulmonary veins carry oxygen-rich blood to the heart.

e. arteries carry oxygenated blood; veins carry oxygen-poor blood.

d.Pulmonary veins carry oxygen-rich blood to the heart.

Explanation:

Pulmonary veins carry blood form the lungs (where the blood is oxygenated) to the heart (left atrium). There are four main pulmonary veins.

Pulmonary veins are exceptions, because, usually veins carry oxygen-poor blood while arteries carry oxygenated blood.

The pulmonary veins are part of the pulmonary circulation.

b.have there own function.

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