The first single-celled organisms on Earth probably evolved (a) 3,700 years ago (b) 3.7 million years ago (c) 3.7 billion years ago (d) We have no idea when the first life on Earth appeared.

Q: Understanding geologic time is significant because it helps us  a. Understand humans’ impact on our…

A: The evolution of different organisms occurs in different time periods on the earth. The primitive…

Q: In which probable stage of physical and chemical evolution of life were gaseous oxygen and water…

A: Earth was formed some 4.6 billion years ago from the sun due to the continuous bombardment of huge…

Q: hat is Evolution of living things  ?

A: Evolution is a complex process by which the characteristics of living organisms change over many…

Q: Which theory of the origin of life do you think is most possible? Why?

A: Earth's life began millions of years ago. There are numerous ideas about the origin of life,…

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: 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: 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: 1. For how long has there been life on Earth? 2. For what percentage of time has life existed on…

A: The geological time scale depicts the various time periods throughout the history of the earth…

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: Are we still evolving , and if so, what will human biology look like in the future?

A: Evolution is a kind of change in a kind of organism over time; process by which modern organisms…

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: 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: How did we define early sciences, which were practiced by humans during stone and bronze ages?

A: The early science or protoscience is the science of ancient history. Since,there were no ways of…

Q: The more DNA and protein sequences two organisms share, the ________________ closely related they…

A: Evolution is a theory which represents the development of new organisms from pre-existing forms and…

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: Explain briefly the following sources of evidence of evolution. Write your references below. 1.…

A: Evolution is a process that took many years to form the present day species. The original species…

Q: Which of the following could be considered paradigm shifts in biology? The discovery that life forms…

A: Paradigm shifts refers to the fundamental change in longtime established ideas or theories  into new…

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: What was the earth like million of years ago?  When did the human race first appeared on Earth?

A: The history of the earth comprises the development of the Earth from its origin to the present day.…

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 theory of the origin of life do you think is most possible? Why?

A: There are so many theories of the origin of life is available. First of all, we will know about the…

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: has been suggested that the current time should be made into a different period. In other words, it…

A: Present period is called holocene epoch. The word is formed from two Ancient Greek words. Holos is…

Q: What is the origin of life or the main ancestor of all organisms?”, what would be your answer and…

A: Answer: As the question depicts that it is the topic of EVOLUTION.  EVOLUTION: this is the process…

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: Which of the following is a prediction that evolution makes about the fossil record? Group of…

A: Answers The correct option would be  b) most recent fossils should be most similar to modern life.…

Q: What period did modern humans evolve?

A: Modern human beings are classified under the Tribe: Hominini under the Suborder: Anthropoidea of…

Q: What two pieces of evidence support the claim that all life on Earth descended from a common…

A: Evolution is the process by which the heritable traits of different organisms evolve over subsequent…

Q: 1. For how long has there been life on earth? 2. For what percentage of time has life existed on…

A: ​The geological time scale relates layers of rock (stratigraphy) and carbon dating to periods of…

Q: The time of greatest evolutionary diversification in the history of life occurred during the (a)…

A: Introduction  Environment plays a major role in the diversification of organisms. For example, if we…

Q: Why did the first animal radiation occur so late in the evolutionary day?

A: Introduction: Evolution can be defined as the process that has given rise to different kinds of…

Q: How does genetics provide strong evidences of evolution of life?

A: Genetics is the field of biology that studies genes, genetic variation, and heredity in organisms,…

Q: what do you want to know about how humans evolved? From what you know already from school or tv,…

A: Humans are considered the most evolved and most developed animals. their evolution is very…

Q: Identify 5 organisms (plants or animals) from the Paleozoic Era and relate them to an organism…

A: Paleozoic Era Paleozoic means ancient life.  It is the earliest of the three geological eras of the…

Q: How do fossils provide evidence of evolution?

A: Fossils are important evidence for evolution because they show that life on earth was once different…

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: 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: Historically, how has the origin of life on earth been explained?

A: Introduction The mythological explanation for the phenomenon of life on Earth is the most frequently…

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 did humans evolve ? where did the earliest form of humans evolve from?

A: Evolution is defined as the change in the characteristics of a population or a particular organisms…

Q: Which eon has more events occurring in it? During which eon did life evolve? What is the difference…

A: Evolution refers to the gradual changes in an organism over a given period of time. These changes…

Q: Evolution is based on which of the following concepts? (a) organisms share a common origin (b) over…

A: Heritable change in the characteristics of biological populations over successive generations is…

Q: Why is there an argument among scientists about recognizing Anthropocene as an epoch?

A: Epoch means an event or a very long time marked by an event that begins a new period or…

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…

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: