There was no sunlight, in one way or another sunlight is the source of almost all life on the surface of the earth
Answer: Chloroplast
Explanation:
Plants use photosynthesis to make energy for themselves and this process is located in the chloroplast. If you can't remember this, you might remember the name chlorophyll which is the food a plant makes. The prefix is similar as you can see.
Answer: Salt, Soda, Fire Extinguishers
Explanation:
Holism.
Explanation:
Anthropology is the branch of scientific studies that deals with study of human development in terms of body structure, culture,social behavior and language.
Biological anthropology deals with the evolution of man on the basis of biological structures.
Cultural anthropology deals with the evolution of different culture and society.
Social anthropology deals with the evolution of various societies from the time when man was totally uncivilized.
Linguistic anthropology deals with the study of evolution of languages.
In short anthropology deals with all the aspects of human beings. This commitment of anthropology to studying the entire picture of human life,including culture,biology,history and language is termed as Holism.
The Precambrian era envelopes the major bulk of the history of the Earth, beginning from the creation of the planet approx 4.5 billion years ago and terminating with the origination of composite, multicelled forms of life approximately 4 billion years after.
The Precambrian refers to the earliest of the geologic ages that are signified by the distinct layers of sedimentary rock. The Earth was about more than six hundred million years old when life started. The planet had cooled down from its native molten state, creating a solid crust and oceans formed by water vapor in the atmosphere.
At about three billion years ago, the atmosphere of the Earth was virtually devoid of oxygen. At approximately 2.4 billion years ago, oxygen was discharged from the seas as a waste product of photosynthesis by cyanobacteria. The levels of the gas slowly raised, attaining about 1 percent around two billion years ago.
Approximately 800 million years ago, the levels of oxygen attained about 21 percent and started to breathe life into more composite species. The oxygen-rich ozone layer was also created, protecting the surface of the Earth from the harmful solar radiation.
