Which of the following represent issues of great uncertainty regarding early Earth? Choose one or more: ✓ A. whether early life forms were thermophiles or psychrophiles B. whether first life was prokaryotic or eukaryotic C. whether life evolved here or was of extraplanetary origin D. whether first organisms were aerobes or anaerobes O E. role of methanogens and atmospheric methane

Q: The Miller-Urey experiment simulated compounds present in the atmosphere of early Earth, lightning,…

A: Miller Use four compounds or particle in his experiment these are water, methane, ammonia and…

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: The oxygen revolution permanently changed Earth’s environment and dramatically impacted the…

A: We are answering first 3 questions. For rest of questions pls repost.     Oxygen evolution is a…

Q: Many scientists claim that the synthesis of the first organic molecules from inorganic precursors…

A: Null hypothesis is a statement which is based upon certain observations and facts.

Q: What was a significant result of the Mars Phoenix project?a. culturing bacteriab. verifying waterc.…

A: Mars, which is a planet of our solar system is believed to have conductive conditions for life…

Q: Which of the following would be the most likely place that life would first form on Earth?

A: Which of the following would be the most likely place that life would first form on Earth?  Answer.…

Q: Which of these did Stanley Miller place in his experimental systemto show that organic molecules…

A: Answer- S.L. Miller experiment concluded the thoery of chemical evolution. He used all the inorganic…

Q: Archaea are often found living in extreme conditions of heat, salt, and acidity, which are similar…

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

Q: Abiogenesisa. refers to the spontaneous generation of organisms from nonliving matter. b. explains…

A: The existence of the planet earth dates back to many billion years ago. However, there was no life…

Q: Investigate and describe how prokaryotic cells photosynthesize without having chloroplasts.

A: This answer is for the first part of the question. In order to get the answer to the second part of…

Q: This group of prokaryotes are not actually closely related but are grouped together because they are…

A: Prokaryotes are the single celled organisms without a proper nuclear membrane. Bacteria is included…

Q: Which of the following events occurred earliest in Earth’s history? a. Membrane-enclosed structures…

A: Recognizable human beings appeared on a geological scale at most 2 million years ago, a vanishingly…

Q: Which of the following describes the organisms and/or processes that were most influential in the…

A: The earth is one of the eight planets revolving around the sun. It is estimated that earth have been…

Q: Antibiotic resistance in bacteria is a result of what process? Selected answer will be automatically…

A: Antibiotic resistance:  Antibiotics are chemical combinations or substances usually prepared to…

Q: Which of the following did Stanley miller place in the experimental system to show that organic…

A: Stanley Miller and Harold Urey's experiments reported evidence of chemical evolution or Chemogeny.…

Q: Which of the following pairs of taxa are most closely related?   A. Eubacteria and Archaea   B.…

A: Taxa are defined as the group or set of one or more population of a specific organism to form or…

Q: Which explanation describes why Archaea are placed into a different domain from Bacteria? O…

A: This Archaea domain contains simple called organisms. Archaea possess features that are similar to…

Q: 2. Why is PCR useful?

A: Option d is the correct answer, that is V, I, II, IV, III. Explaination- First eukaryotes- App.…

Q: What did the biology experiments on the Viking landers discover? A. Although Mars's soil is…

A: The Viking Program consisted of two American space probes, Viking 1 and Viking 2, that were sent to…

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: Explain how the origin of eukaryotic cells involved a unionbetween bacterial and archaeal cells.

A: Answer- The eukaryotic cells are evolved from the prokaryotes.

Q: Martian meteorites found in Antarctica were determined to possibly contain life. Scientists looked…

A: Known as ALH 84001, the Martian rock whose remains were present in meteorites contained structures…

Q: How the evolution of oxygen was involved in the initial evolution of terrestrial life

A: Photolysis of water vapors and carbon dioxide produce hydroxyl and oxygen, individually, thus, they…

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: ummarize the theories on how life on Earth began A. Inorganic molecule form organic molecules. B.…

A: Introduction: Abiogenesis is a scientific theory that explains the origin of life from non-living…

Q: Choose the most appropriate statement that matches each term. a substance that occurs only or…

A: Here, it is required to select the appropriate sentence for each term.

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: 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: 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: 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: Describe some of the hypotheses on the origin of life and the characteristics of early prokaryotes,…

A: The natural process through which life has developed from non-living materials, such as basic…

Q: Biologists at NASA are studying new life forms found in the arctic and have collected an unknown…

A: The living organisms composed of cells. The cells are classified into prokaryotic and eukaryotic…

Q: Cyanobacteria was responsible for the increase in oxygen levels billions of years ago. They play a…

A: Answer : The Cyanobacteria were quite simple organism however carried out a crucial role in…

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: Oceans were a good environment for early organisms because tney O shielded organisms from…

A: According to guidelines we have to answer the first question only so please kindly post the…

Q: Which of the following statements does not support how prokaryotes have a large amount of genetic…

A: Prokaryotic cells have developed a number of methods for recombining their genetic material, which,…

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: Which of the following organisms appeared on earth first?     Prokaryotes     Eukaryotes…

A: Earth is considered to be the 4.5- 5 billions year old and is the habitat of vast form of lifes.

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: The first forms of life on Earth were thought to be_________. a. single-celled plants b. prokaryotes…

A: A) single celled plants

Q: (e) If you collected a sample of water being ejected from Saturn's moon, Enceladus, you could…

A: A sample-return mission is a spacecraft mission that collects and returns samples to Earth for study…

Q: Stanley Miller’s classic experiment suggests that ______ ______ of organic compounds may have been…

A: Scientists estimate that the universe is around thirteen thousand eight hundred and twenty billion…

Q: Scientists think that terrestrial life probably originated in Earth's oceans because Choose one:…

A: Question - Scientists think that terrestrial life probably originated in Earth's oceans because…

Q: Choose the word that corresponds to the definition. v A chemical that contains a carbon double…

A: Since the words are missing answers are from a general prospective.    Biology is the branch of…