This kingdom can live in harsh environments, like extremely hot or cold environments

These organisms are a part of the kingdom Archaebacteria (otherwise known as just "Archaea")

These organisms are a part of the kingdom Archaebacteria (otherwise known as just "Archaea"), which consists of bacteria. ... This, archaebacteria undergo anaerobic respiration. This is a characteristic that allows such organisms to live in the harsh conditions in which they are found.

the sphincter muscles at the end of the digestive tract is the anus.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.