The oxygen revolution changed Earth’s environmentdramatically. Which of the following took advantage of thepresence of free oxygen in the oceans and atmosphere?(A) the evolution of cellular respiration, which used oxygen tohelp harvest energy from organic molecules(B) the persistence of some animal groups in anaerobichabitats(C) the evolution of photosynthetic pigments that protectedearly algae from the corrosive effects of oxygen(D) the evolution of chloroplasts after early protists incorporated photosynthetic cyanobacteria

Q: When did photosynthetic organisms first appeared? O From the very beginning of life, they are some…

A: Photosynthetic creatures, also called photoautotrophs, are photosynthesis-capable organisms. Higher…

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: 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 is the implication of having oxygen-producing organisms evolve earlier than hypothesized?

A: Introduction  The process of change in heritable characteristics through successive generations is…

Q: Chronologically arrange the evolutionary events with 1 being the earliest and 6 the most recent.…

A: Chronological event describe the timing of event as it occurred in the event of time period.…

Q: In the 1950s, scientists Miller and Urey conducted a classic experiment in which water, methane,…

A: Evolution is the study of origin of earth, origin of life on earth and relationship between…

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: What is the correct order of appearance in the fossil record, starting with the earliest: eukaryotic…

A: They consist of eubacteria and archaebacteria. Bacteria are simple prokaryotic organisms which are…

Q: In the geologic time scale, there is a large delay between the evolution of photosynthetic bacteria…

A: Option (A) is correct option . The evolution  of photosynthetic bacteria occured 3.4 billion years…

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: 1. Label the Last Universal Common Ancestor on this tree. 2. Where on this tree would you find…

A: According to bartleby guidelines we’re answering first 3 sub-parts and please repost other questions…

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: Why was the evolution of photosynthesizing bacteria important for the evolution of large,…

A: Cyanobacteria, which are capable of photosynthesis, are the general name for photosynthesizing…

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: 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: How did the photosynthesis process allow for the evolution of other, non-photosynthetic organisms?

A: Plants play important role in producing oxygen on the earth. Plants go through the process known as…

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: Around the time Eukaryotic Cells began to compartmentalize their reactions, and the chloroplast and…

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

Q: How can we use the structures that are involved with photosynthesis and cellular respiration to…

A: Photosynthesis is the type of cellular process in which the autotrophs, particularly the plants can…

Q: Imagine you were to find a fossilized animal bone containing one-eighth the amount of carbon-14…

A: Given information: Carbon-14 present in the fossil is 1/8th of the earth's atmosphere today. The…

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: Compare and contrast the physical and chemical conditionson Earth at the time life first arose with…

A: Earth is a planet which supports numerous life system and abiotic factors. Earth formed 4.5 billion…

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: Chloroplasts and mitochondria evolved from an endosymbioticrelationship involvinga. purple bacteria…

A: Prokaryotes are the primitive organisms that were the first to develop and harness life on Earth.…

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: “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: mini threshold of life's evolution,

A: A threshold is a kind of abrupt elevation in the complication that produces new, resulting in…

Q: The animals body plans that emerged from the Cambrian Explosion were multi-cellular and…

A: Originally, geologists identified the start of the Cambrian Period as the first appearance of…

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: Which of the following is the most probable order of appearance of molecules the evolution of life…

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

Q: What was the most significant contribution of early photosynthetic organisms to Earth’s environment?

A: Photosynthesis is preparation of food by the use of light and carbon-dioxide gas.

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: 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: Which of these provides evidence of the common ancestry of all life? A) the ubiquitous use of…

A: One of the strongest evidences for common descent and ancestry comes from gene sequences.

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: Approximately how long ago did homo sapen (humans) first  appear on Earth 2,000 years ago 5-7…

A: Homo sapiens are the species to which all modern human beings belong. The average brain mass of H.…

Q: The evolution of eukaryotes was most directly enabled by which of the following? a. Diversification…

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

Q: Which of the following occurred first in the history of life on earth? Colonization of land…

A: In the starting phase of formation of the earth, the planet was filled by reducing gases that did…

Q: Why did the evolution of multicellular organisms such as plants and animals have to be preceded by…

A: evolution is a process or a theory that describes how the organisms developed from simple organic…

Q: Explain why the Oxygen (3800-3500 million years ago) is important and elucidate the impact of that…

A: Life originated around 4 billion years ago in the deep-sea hydrothermal vents and around 3.6 billion…

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 of the following did not contribute to Earth's present atmospheric concentrations of oxygen…

A: *Atmosphere is a layer of gases which is held by gravity of the planet body. *planet retains…

Q: Chronologically arrange the evolutionary events, with 1being the earliest and 6 the most recent.___…

A: Chronological event describe the timing of event as it occurred in the event of time period.…

Q: Describe in general terms how the appearance of molecular oxygen in Earth’s atmosphere about 3…

A: The earth was created almost 4.5 billion years ago. The evidence suggests that the planet was devoid…

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: