#What is the meaning of life series

Unfortunately, though, most of the species that lived on Earth already met their demise. Species diverge into two or more descendant species throughout the course of evolution. Along with evolution, speciation transpired. Engaging in symbiotic relationships with other organisms could also help increase the propensity to survive and thrive. The organisms need to have the capacity to adapt genetically and phenotypically. Nevertheless, mammals took the open niche and expanded.Д®volution is crucial for life to persist in the ever-changing Earth. However, a mass extinction occurred and caused the death of the dinosaurs as well as other large animals. These animals dominated the land, the seas, and the air of the Earth. The next era ( Mesozoic era) is called вЂњthe Age of the dinosaursвЂќ. Apparently, a mass extinction called вЂњthe Great DyingвЂќ occurred and wiped about 90% of life on Earth. During this period, the early dinosaur ancestors, archosaurs, also appeared. The therapsids, in turn, evolved and gave rise to cynodonts, which were the early ancestors of animals. A reptile group Dimetrodon evolved and gave rise to therapsids. Because of this, reptiles flourished as they were able to thrive even in such habitats. This caused the inland to be very dry and arid. For instance, during the Permian period of the Paleozoic era, the Earth had a supercontinent called Pangaea surrounded by Panthalassa ocean. Tracking the history of life at various geologic eras, one would find several mass extinctions occurring in between the bursts of life. They first appeared about 600 million years ago. Over a significant period of time, these life forms evolved into single-celled organisms. RNA-based, self-replicating entities are held as the descendants of all living things. It was presumed that only after about one billion years from the time that the Earth first came into being that life began. The primitive condition of the Earth was hostile to life. At one point, the Earth was an inhabitable planet.

#What is the meaning of life series

The Earth itself goes through a series of changes. Without evolution, life may not be the way as we know it. Some traits will become predominant while others will become rare over the course of time. An organism is capable of changing through time to adapt to its environment.Д«iologically, evolution is important because it drives biodiversity. One of the hallmarks of life is the ability to reproduce, i.e. An organism has an ability to respond to stimuli or to its environment, usually through a series of metabolic reactions. It would also be capable of decomposing organic matter through catabolism. A living thing would be capable of converting energy from chemicals into cellular components through anabolic reactions. A life form would have an ability to keep up its existence, for instance, by regulating its internal environment to keep up a constant or favourable state. A cell is the basic structural and functional unit of any organism.

In particular, a living thing is made up of a single or a group of cell(s). Living things are have an organized structure to perform a specific function. Despite the irresolute answer for questions about life, the basic characteristics of a living thing are as follows: Does it begin at the time of fertilization or the time before or after that? The origin of life is also contestable. There is no consensus regarding the answer to the question as to when does life begin.