Decreases in oxygen level at high altitudes cause hemoglobin levels in the bloodstream to rise because

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;