Q: Why are the two great oxygenation events in the earth’s atmosphere seen as key prerequisites for the…
A: The two great oxygenation events or oxygen revolution was a time period when earth's atmosphere and…
Q: Explain what causes the mantle to '' flow ''?
A: The rocks that make up Earth's mantle are mostly silicates—a wide variety of compounds that share a…
Q: How did discoveries in the deep sea influence scientists' ideas about whether life could be found…
A: A discussion of life elsewhere therefore naturally begins with a review of some key aspects of the…
Q: What evidence would you look for on one of these moons that would tell you that life may have…
A: The proof that we would look at Moon is about the indication for aspects of life.For example-…
Q: Was there molecular oxygen in the earth's primitive atmosphere? How has that molecule become…
A: Oxygen is one of the most important molecules or elements for all living organisms. It is…
Q: Is climate change a natural process?
A: Climate is the average weather conditions of a region including temperature, air pressure, humidity,…
Q: Do you think that the average annual global temperature and carbon dioxide levels have been…
A: According to the question, we have to explain that the average annual global temperature and carbon…
Q: Describe how the sudden appearance of oxygen in the atmosphere about 2.5 billion years ago…
A: Since life first emerged on Earth between 3.5 and 4 billion years ago, it has continued to develop.…
Q: Before the emergence of life of what gases was the earth's primitive atmosphere constituted?
A: the primitive atmosphere was reducing in nature it had little or no oxygen it was rich in water…
Q: How did the origin of photosynthesis affect subsequentevolution of life on Earth?
A: Evolution is a series of events through which new biological species develop over time from…
Q: Describe how scientists have tested the hypothesis that simpleorganic molecules could have formed on…
A: There are fossils that were discovered from Western Australia 3.5 million years ago (mya). This…
Q: How is origin of life attributed to LIGHT and WATER? Give a detailed explanation.
A: The origin of life is still a mystery and not proved. There are many theories that are suggested by…
Q: How could the biological carbon cycle have worked on the primitive Earth, where oxygen gas was…
A: Introduction : The balance of the nutrients in the biosphere makes life sustainable. The movement of…
Q: In what order did events occur that led to life on Earth? (1) appearance of aerobic organisms, (2)…
A: C is possible right answer
Q: How can life possibly evolve in such an inhospitable environment?
A: Evolution can be defined as the unrolling of nature that brings about an orderly change from one…
Q: What evidence would you look for on Enceladus, Europa or Mars that would tell you that life may have…
A: Europa is the smallest of four Galilean moons orbiting Jupiter. Enceladus is the sixth-largest moon…
Q: What was the composition of the earth’s atmosphere at the time of the origin of life, and how did it…
A: Earth was originally in the molten lava state mainly consists of hydrogen sulfide and other…
Q: During the Early _______________, life consisted of prokaryotic cells, but by the end of this…
A: The major evolution evens since the origin of the earth have been categorized into three major eras.
Q: In trying to understand the formation of the early Earth, some researchers have suggested that the…
A: 1) According to this article the earth's water came from icy comets pelted on earth and deposited…
Q: Why do scientists think that all forms of life on earthhave a common origin?
A: Primitive atmosphere was reducing rich in Hydrogen (H2) and free molecular oxygen (O2) was absent,…
Q: What was the Earth like million of years ago?
A: Millions of years ago, there is no life on the Earth. The temperature of the Earth was scorching,…
Q: The elements that present in Protoplasm Carbon, Hydrogen Carbon, Hydrogen, Nitrogen, and Oxygen…
A: The living organisms contain cells that are the smallest structural and functional unit of the body.…
Q: “Life has profoundly changed the Earth.” Explain whether or notthese experimental results support…
A: The earth was formed about 4,570 million years ago and over the passage of time, different…
Q: Which of the following is true? A) Life originated around volcanic vents deep in the oceans. B)…
A: Abiogenesis is the theory that explains that life originated by the spontaneous process in hot…
Q: Assuming that the early lithosphere had already been created, which sphere (the atmosphere or the…
A: Introduction The Stiff, Outermost Shell Of A Terrestrial-type Planet Or Natural Satellite Is Called…
Q: Which scientists investigated the origins of organic molecules on the primordial Earth?
A: Evolution is a continuous process and we are still evolving. Evolution is nothing but adapting to…
Q: Which of the following is not thought to have been a source of organic molecules on early Earth?* O…
A: Cosmic dust
Q: Why was it believed that life began in the seas and not in land or air?
A: Scientists believe that the life on the earth began in the depths of the ocean and not on the…
Q: A. What is the PROTEROZOIC LIFE? B. Discuss the Great Oxygenation Event. C. Discuss the CAMBRIAN…
A: Geological time scale is a evolutionary event which determines how the life appear , its…
Q: Given that the early atmosphere did not contain oxygen gas, using only the information covered in…
A: Photosynthesis is a process that occurs in plants and also other organisms such as fungi, bacteria,…
Q: How would you describe earth of millions year ago
A: It is believed that our planet Earth is about 4.54 billion years old. About 3.5 billion years ago…
Q: For how long has there been life on Earth? For what percentage of time has life existed on Earth?…
A: The age of the earth and proper research about the origin timelines of life had not yet researched…
Q: where on the earth did life mostly likely first emerge, where all the ingredients and conditions for…
A: There is an evidence that life began as early as 4.5 billion years ago , and had been reported in a…
Q: Could the First Biological Molecules Have Formed NearVolcanoes on Early Earth?
A: In 1953, Stanley Miller conducted an experiment in the laboratory of Harold Urey to understand the…
Q: 1.The zone of the earth that is divided into rigid plates is the: a.atmosphere b.lithosphere…
A: lithosphere The covering and the upper layer of the mantle together make up a zone of unbending,…
Q: To what extent might ocean habitats have changed over long periods of geological time? How might…
A: The ocean may appear to be a vast and constant expanse, but the world under the waves has changed…
Q: The oxygen revolution changed Earth’s environmentdramatically. Which of the following took advantage…
A: The earth is approximately 4.54 billion years ago and the conditions at that time were not meant for…
Q: Here is the question: What was the likely source of the raw material incorporated into the first…
A:
Q: Compare the changes in Earth's past and present atmosphere Earth's atmosphere today - Traces of…
A:
Q: What is the name of the evolution where carbon, oxygen, nitrogen were formed?
A: Carbon, nitrogen and oxygen They are the three main basic components of life. Life is impossible…
Q: List three locations where the building blocks of Earth’s first lifemay have formed
A: The biological event through which life has originated from non-living matter, like simple organic…
Q: Based upon our current understanding of the abiotic origin of life, which of the following molecules…
A: Abiogenesis is the generation of life from nonliving matter. It is now more precisely known as…
Q: Which sequence of events accurately describes the history of the planet (from oldest to youngest)?
A: The history of our planet, Earth, started with the formation of the solar system. The solar system…
Q: How does matter and energy circulate in nature? Energy circulates through living things. Energy…
A: In our ecosystems, matter and energy are transferred from one form to another. Matter refers to all…
Q: Which of the following areas is NOT part of the lithoecosphere? A. Polar caps B. Erupting volcano…
A:
Life originated from the earth’s inorganic atmosphere in the post, but this no longer happens today. Give two reasons?
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- Assuming that the early lithosphere had already been created, which sphere (the atmosphere or the hydrosphere) was formed next? Why do you say so? (explain constructively)Before the emergence of life of what gases was the earth's primitive atmosphere constituted?How do we know when oceans were first present on Earth?Why is the presence of oceans significant to the origins anddiversification of life?
- Scientist have determined that the early Earth had no free oxygen anywhere. Briefly explain what evidence in the rock layers that scientists found to prove when the early conditions on earth had free oxygen in the atmosphere.What was the composition of the earth’s atmosphere at the time of the origin of life, and how did it differ from the atmosphere of today?How the evolution of oxygen was involved in the initial evolution of terrestrial life?
- For how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?Arrange these events in order of occurrence, with 1 being the earliest and 6 the most recent: ___1 a. Earths first seas form ___2 b. origin of mitochondria ___3 c. first protocells form ___4 d. Precambrian ends ___5 e. origin of chloroplasts ___6 f. first animals appearThe first interval of Earths existence is called the ________. a. Cambrian c. Proterozoic eon b. Hadean eon d. Archean eon