Direct evidence of life on early Earth comes from fossils of microorganisms that lived 3.5 billion years ago. But how did the first living cells appear?

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: In what way was the evolution of eukaryotic cells linked to the increase in the oxygen concentration…

A: Evolution is a continuous process and we are still evolving. Evolution is nothing but adapting to…

Q: Place these events in the history of life on Earth in the order that they occurred. a. accumulation…

A: Evolution is the process of slow gradual change over a period of time.  The process of evolution…

Q: What experimentation has been done on finding the source of raw material for the first life on…

A: Raw materials  Raw material are the basic materials from which the things are made. Like raw…

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: How do biologists define life, and what were the origins of life?

A: This question is about and origin of life.

Q: 1.3 What are the pieces of evidence on the evolution of life which may have enabled the first forms…

A: Perhaps the most persuasive fossil evidence for evolution is the consistency of the sequence of…

Q: Which of the following events occurred first in eukaryotic evolution? a. Endosymbiosis and…

A: Answer is c.)  compartmentalization and formation of nucleus.

Q: Original cells were anaerobic and prokaryotic cells Eukaryotes evolved Multicellular organisms…

A: Evolution is a mechanism that causes changes in a population's genetic material over time. The…

Q: During the first 600 million years of Earth history, enzymes, ATP , and other molecules could have…

A: The primitive earth was in the form of a red hot, solidified cloud containing free atoms. The…

Q: No one knows exactly when or how the first living organisms evolved, but we know that life existed…

A: Just as the universe is believed to have been formed due to the occurrence of the 'Big Bang', the…

Q: During what geologic period did life on Earth begin?

A: Evolution is the process of gradual changes occurring in the species over a period of time, when the…

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: The first single-celled organisms on Earth probably evolved (a) 3,700 years ago (b) 3.7 million years…

A: Evolution is a process of slow and gradual change over a period of time. There are many pieces of…

Q: With regard to the origin of life, why are biologistsinterested in the prebiotic synthesis of…

A: Introduction The Oparin-Haldane model suggested that under the highly reducing atmosphere of…

Q: How would the appearance of protocells have represented a key step in the origin of life?

A: Introduction  Origin of life on earth can be traced back to 3.4 billion years ago and as we now know…

Q: How did scientist think the first life may have evolved on earth?

A: Evolution is the change in the characteristics of a species over several generations and it relies…

Q: Why was it believed that life began in the seas and not in land or air? * Land and air were…

A: Option a is correct  Land and air were inhospitable places for life during the archean eon.

Q: Why were cyanobacteria so important in the evolution of life onEarth?

A: Cyanobacteria is a known phylum that is known to contain the photosynthetic bacteria along with the…

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: 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: 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: Why are scientists interested in the primordial synthesis of organic molecules when it comes to the…

A: Introduction: The Oparin-Haldane hypothesis proposed that inorganic molecules in the atmosphere of…

Q: Why do scientists think that the increased availability of oxygen in the atmosphere was an O…

A: Answer :- The increased availability of oxygen in the atmosphere was an important contributing…

Q: Why was the development of enzymes fundamental to the evolution of life?

A: Answers:  ENZYMES = These are the chemical molecules produced by many microorganisms, When they…

Q: History of life List five of the most important or most significant events in the history of life on…

A: The change in the heritable characteristics of the species across many generations is called…

Q: Below are some key events that took place during the long history of life on Earth. Arrange them in…

A: Constant change has characterized earth since its beginning some 4.5 billion years ago. life…

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: Which molecule -DNA or RNA- do scientist believe was found in the first life form on Earth? Why do…

A: DNA is the double helix structure. RNA is the signal helix structure.

Q: Match the forms of life below with the earliest (approximate) time that it existed. Note: the earth…

A:

Q: How did the presence of molecular oxygen in the atmosphere affect early life?

A: Life originated nearly 3.6 billion years ago in the deep ocean.  The first organisms to be evolved…

Q: In which era did humans first appear on Earth? O A. Paleozoic O B. Mesozoic C. Precambrian O D.…

A: Humans do not evolve from the todays chimpanzees but human develop along side with the chimpanzees…

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: How have changes in earths systems contributed to the evolution of life?

A: Earth and its environment are persistently modified. Plate tectonics move the landmasses, raise…

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: What evidence is there for the hypothesis that life originated on Earth by the creation and…

A: The origin of life on the earth is both an interesting and a difficult question to answer. We have a…

Q: For a long time, it was believed that life originated from decaying matter. What is this theory…

A: For a long time, it was believed that life originated from decaying matter. This theory is known as…

Q: Oparin-Haldane hypothesis

A: Answer:

Q: Why are archaebacteria called living fossils?

A: Introduction: "Archae" stands for "ancient", archaebacteria are thought to evolve from the very…

Q: A. What do scientists think the primitive Earth was like? Give 3 evidences.   B. How could life…

A: Our current atmosphere of twenty one percent oxygen would make the emergence of DNA & other…

Q: Approximately when did life first appear on land A. 500 million years ago B. 2 billion years ago…

A: Question - Approximately when did life first appear on land A. 500 million years ago B. 2 billion…

Q: If life comes from life, where did the first living organisms come from?

A: Introduction  Origin of life on earth can be traced back to 3.4 billion years ago and as we now know…

Q: If living cells were produced in a test tube from nonbiological components by chemical processes,…

A: The first cells that appeared on the earth are believed to be prokaryotic heterotrophic and are…