The drastic decline in sea urchin populations in the Caribbean reef systems allowed algae to overgrow corals, resulting in depredation of the coral reef systems. When urchin populations rebounded, the coral population did not fully return. The Caribbean reef systems exhibited

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

food source and hunting?

answerwestern plateau,     central lowlands,     great dividing range;