I'm pretty sure it is the left ventricle.
Natural selection is a process where living things that are better adapted to the environment around them survive longer and produce more off springs .
A lunar eclipse can last for a couple of hours and some minutes
Living things in the environment such as plants, animals, and bacteria are biotic factors. Biotic factors also include once-living parts such as dead leaves on the forest floor. Abiotic factors are nonliving aspects of the environment such as sunlight, temperature and water. One important abiotic factor is soil.