Why do scientists think that all forms of life on earthhave a common origin?

Q: 4. Fill in the table: Step of how life started 1- evolution of monomers 2- evolution of polymers…

A: The flow of genetic information in a biological system is explained by central dogma and it involves…

Q: One of the simplest definitions of a life-form is anything with the capacity to reproduce and…

A: A UCL-led research team has created protocells in hot, alkaline seawater, adding to evidence that…

Q: RNA is often characterized as being the first“biologically active” molecule. What two properties or…

A: The RNA world is a hypothetical stage in the evolutionary history of life on earth, in which self…

Q: When considering the entire period of time during which life on Earth has been evolving, we must…

A: To understand the change in flora and fauna that have occurred over million of years on Earth ,we…

Q: One of the prerequisites for chemical evolution on early Earth is that there was an adequate amount…

A: Early earth is not rich with oxygen until photosynthetic bacteria arrived after that oxygen levels…

Q: Once life began, what types of organisms lived on Earth forthe next two billion years? Where did…

A: Introduction There are several hypotheses presents on that how life starts on the primitive earth.…

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

A: Harold Urey and Stanley Miller are two American scientists who attempted to create similar…

Q: None

A: Cell Theory is a fundamental principle in biology that states:All living organisms are composed of…

Q: What is a domain ? What are the three domains of life on Earth? Explain briefly.

A: Domain is the highest taxonomic rank in the hierarchical biological classification system, above the…

Q: How did life first begin on Earth?

A: The Earth was created about 4.5 billion years ago. Scientists and researchers believe that the…

Q: Which of the following conclusions about this form of life would be most justified?

A: Any life form that exists must have some form of central dogma for functioning and survivability,…

Q: Why do radioactive isotopes in rocks nearly all have half lives of many millions to billions of…

A: Radioactive substances are substances that have unstable nuclei as a result they become stable by…

Q: Direct evidence of life on early Earth comes from fossils of microorganisms that lived 3.5 billion…

A: The earliest life structures we are aware of were minuscule organic entities (microorganisms) that…

Q: Why are cells, not atoms, the basic units of life?

A: A cell is the smallest unit of life because it is the unit that can carry out all the functions of…

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: Without an oxygen-free atmosphere, the organic compounds that started the story of life never would…

A: The Earth has been significantly altered by life. Organisms have influenced the composition of the…

Q: When did man first appear on Earth?

A: Human evolution is the evolutionary process that led to the emergence of anatomically modern humans.…

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: Compare and contrast the evolutionary theory and creationism theory on the origin of life molecules,…

A: INTRODUCTION Creatoinism The creationism theory state that the whole universe, Earth and life in it…

Q: Place the following events of the beginning of life in their correct order. - organic polymer form -…

A: Life was begined with the inorganic molecules which further interact to form organic molecules which…

Q: Four billion years ago, the Earth was a thin-crusted inferno. Which probable stage of physical and…

A: Solar system was originated around 4.6 billion years ago from contraction of rotating gas and dust…

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: Which of the following evidence most strongly supports the common origin of all life on Earth? *

A: Answer : Universality of the genetic code.

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: - How much time does it take for 1 half-life to occur?   -Approximately how many half-lives are…

A: Carbon is the element that is most commonly found in organic molecules. All organisms have a carbon…

Q: Explain the three domains of life (Bacteria, Archea and Eukaryota) If you were to choose what domain…

A: Three domains system theory was given by Scientist Woese while working on the evolutionary model of…

Q: The origin of life happened under planetary conditions C very similar than those at the present…

A: There has been much discussion over the beginning of life on Earth. The evolution of life has been…

Q: Geological time covers huge spans, up to billions of years. Yet humans rarely live for more than 100…

A: Geological time scale is important to understand the history of earth that how several natural…

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

A: Genesis of life is the concept that tries to provide an answer to how life started, especially on…

Q: Which of the following is not a fundamental characteristic of all of life on earth? a. all life…

A: While many organisms on Earth do indeed require oxygen for their metabolism there are also numerous…

Q: What does Oparin – haldane hypothesis about origin of life suggests.

A: The Oparin-Haldane theory of the origin was discovered by two scientists Aleksandr I. Oparin and J.…

Q: Which of the following are considered emergent properties of life? Check all that apply. Electrons…

A: ANSWER:- Release of energy from glucose during metabolism Three-dimensional structure of different…

Q: the landmark experiment by Miller and Urey, and various repeats of this experiment, did not…

A: Introduction: The mentioned experiment was carried out to understand the various ways in which the…

Q: Choose one theory that you think best explains the origin of the universe.

A: Since the 1980s, RNA World has been the prevailing theory regarding the origin of life. The…

Q: Why do biologists construct ‘a tree of life’?

A: The “tree of life” is basically a metaphor used to designate the evolutionary tree or diagram of the…

Q: What are the advantages of live preparations?

A: Vaccines impart adaptive immunity against certain pathogens.

Q: Imagine an ancient sunlit estuary rich in clay deposits. Countless aggregations of organic molecules…

A: Several hypotheses have been made in relation to life's origins on Earth. In 1936, Alexander Oparin…

Q: What do we mean when we write “all life in Earth is fundamentally the same”? A shark and a seaweed…

A: Living organisms are well arranged, which means that they are specialized. All living organisms…

Human Evolution

Human evolution is the process of evolution of humans from early man to anatomically modern humans. The process of evolution in humans leads to the gradual development of traits like bipedalism. Humans are the highly social animals that make them the most advanced animal on Earth.  Human evolution is an outcome of interaction among the following processes: