- How much time does it take for 1 half-life to occur?   -Approximately how many half-lives are there in 20,000 years?   -If 30 percent of the carbon-14 atoms remain in a sample, how long ago did the organism die?

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: What is the most logical theory on the topic of the Origin of Life?

A: In the 1920s, English scientist John Burdon Sanderson Haldane and Russian scientist Aleksandr Oparin…

Q: Which bits of evidence would convince you that life originated as early as 3.2 bya? a. You look at…

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

Q: Which molecule is believed to have preceded the other two during the evolution of life? RNA…

A: Introduction :- When an environmental shift makes new resources available or poses new environmental…

Q: What evidence would you look for on one of these moons that would tell you that life may have…

A: The proof that we would look at Moon is about the indication for aspects of life.For example-…

Q: What are the eons in which the following events occur? Origin of Earth. Oxygen appeared in the…

A: Eon is geologic time and it is such a long time that cannot measure. Firstly, the origin of the…

Q: What does it tell us if we discover life on one of these moons and it has characteristics similar to…

A: If we discover life on one of these moons and it shows alike characteristics as that of earth then…

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: 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: -If 30 percent of the carbon-14 atoms remain in a sample, how long ago did the organism die? -Is…

A: The unstable isotope of the carbon is Carbon 14 (C-14). The half-life of a C-14 is 5730 years old.…

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: 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: State in what ways Stanley miller simulated the condition of :-i) Primitive atmosphere on earth.ii)…

A: Stanley miller performed an experiment to prove that organic molecules were produced by the…

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: ich of the following questions about the origin of life on Earth is most scientifically testable? *…

A: Different theories have been put forward to explain the origin of life on earth. Some of those…

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 originated from the earth’s inorganic atmosphere in the post, but this no longer happens today.…

A: Theories from various scientists propose that in Earth's prebiotic history, simple organic matter…

Q: and why? W

A: INTRODUCTION  Before long and many years, progressed space-and ground-based observatories will…

Q: What was the composition of the earth’s atmosphere at the time of the origin of life, and how did it…

A: Earth was originally in the molten lava state mainly consists of hydrogen sulfide and other…

Q: The most pivotal event in the history of life on Earth, allowing for the emergence of eukaryotic…

A: A Eukaryotic cell is a Membrance bound organelle like Endoplasmic Reticulum, Mitochondria and…

Q: What model for WHERE life began (not HOW life began) seems to be highly unlikely, and which model is…

A: Introduction :- Evolution is the phenomenon which leads to the origin of first life on our planet…

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: What is a half-life? How is it used to date fossils? Give 2 or 3 examples of isotopes used for…

A: Geologists often use various techniques to find out the age of fossils. This method is also used to…

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: 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: I. Formation of Planet Earth (- BYA) : derived from the : incandescent and largely : as temperature…

A: Formation of planet earth 4.5 billion years ago : derived from the Solar nebula : incandescent and…

Q: HOW OLD IS EARTH?   HOW LONG DID THE LONGEST EON (SO FAR) LAST?

A: Different planets have different atmosphere.

Q: which term describes any ancient remains, impressions, or traces of an organism or traces of its…

A: Certain minerals may be smelted more easily than others, and these are known as ore minerals.…

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: 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: Which of the following is not thought to have been a source of organic molecules on early Earth?* O…

A: Cosmic dust

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: 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: Which parent isotope is most useful for dating samples that are greater than 100 million years old?…

A: Radioactive decay is a process in which the unstable isotopes (natural) emit radioactive particles.…

Q: Based on the Origin of Life by John H. McClendon, how did life on earth start based on the different…

A: The origin of life on earth is mysterious and difficult to determine because it began at least 3.8…

Q: Studying the decay of radioactive isotopes in dead organisms helps scientists to identify fossilized…

A: In the decay of radioactive isotopes after the death of an organism, there is radioactive…

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: Give 1 reason from the reading that shows that there are no life forms on Venus.

A: Venus is the second planet in our solar system that is named after a female. It is slightly smaller…

Q: What is the name of the evolution where carbon, oxygen, nitrogen were formed?

A: Carbon, nitrogen and oxygen They are the three main basic components of life. Life is impossible…

Q: Oparin-Haldane hypothesis

A: Answer:

Q: Which of the following was likely MOST important for life to begin existing on Earth?   A. sunlight…

A: The correct answer is-  C. Sunlight

Q: Radiometric dating is a technique used to determine the age of rocks. Geologists have used this…

A: Radiometric dating is a technique used to determine the age of rocks. There is a constant rate of…

Q: Life first appeared on Earth ___________ of years ago. Choose one: A. billions B. hundreds…

A: Earth is formed around ~4.5 billion of years ago. Life on earth had started after some time.

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…

Q: Radiometric dating ... All of these answers are true O provides an accurate means of determining the…

A: Radiometric dating  Technique used to date materials such as rocks by observing the abundance of…