I'm single so that mean I do what I want, oh

Identify the structure of the human heart which is a muscular chamber that pumps blood out of the heart and into the circulatory system.

The invention of photography was initially important because

Stop pause the type of tectonic plate movement that occurs due to forces of a mantle convention and result in the subduction of lithosphere causinga. hot spotsb. rift valleys c. ocean trenches d. mid ocean ridges