It created an opportunity for the mammals to become dominant on earth by wiping out the dinosaurs.
Blood enters the pulmonary vein with close to 100% of the blinding site for oxygen saturated.
Answer:
Troposphere, stratosphere, mesosphere, thermosphere
this is the layers from space into earth
Answer: <span>hyaline cartilage rings
Hyaline cartilage rings in a shape of a C prevent the tracheal wall from
collapsing inward and obstructing airway (during inhalation). Posteriorly (</span><span><span>open portion of each ring) </span>there is not cartilage but there is muscle so that the esophagus can stretch (the </span>esophagus is behind the trachea).
