I don't know answer, but my answer is the leaf segments, whole communities, and plant dominated aquatic ecosystems and present contemporary methods tailor made to quaintly photosynthesis and carbon fixation underwater.
The left ventricle is responsible for pumping oxygenated blood throughout the entire body, which requires a lot of work and pressure, hence why it is super thick.
Also, just as a heads up. I saw the previous person posted a link. Remember not to click any links that lead to domains which are unknown to you. They could hold a virus.
