Question

according to geological timetable the cellular organisms appeared fast in which era??
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Answer 1

This timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. In biology, evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organization, from kingdoms to species, and individual organisms and molecules, such as DNA and proteins. The similarities between all present day organisms indicate the presence of a common ancestor from which all known species, living and extinct, have diverged through the process of evolution. More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct.Estimates on the number of Earth's current species range from 10 million to 14 million,of which about 1.2 million have been documented and over 86 percent have not yet been described.[5] However, a May 2016 scientific report estimates that 1 trillion species are currently on Earth, with only one-thousandth of one percent described.

While the dates given in this article are estimates based on scientific evidence, there has been controversy between more traditional views of increased biodiversity through a cone of diversity with the passing of time and the view that the basic pattern on Earth has been one of annihilation and diversification and that in certain past times, such as the Cambrian explosion, there was great diversity.

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Answer 2

Answer:

Explanation:

he first living organisms to appear on the earth are thought to have been anaerobic unicellular organisms, who used marine organic substances without using oxygen . Let us now look at the changes that occurred in organisms over time according to the divisions of geological time periods.

The period from the formation of the earth until 560 million years ago is called the Precambrian age, and the first life form appeared during this time. Later, photosynthetic bacteria and cyanobacteria appeared in the ocean. These bacteria were able to synthesize organic substances using carbon dioxide, thus causing oxygen to gradually increase in the atmosphere. Organisms became multicellular, and eukaryotes emerged .

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