Which of the following events occurred earliest in Earth’s history? a. Membrane-enclosed structures developed. b. O2 gas accumulated in the atmosphere. c. Organic molecules formed. d. CO2 gas appeared in the atmosphere

Q: How can you know what happened millions of years ago if no one was there to see it  Explain

A: Every living creature on the planet has the potential to evolve into something. Cells adapt to…

Q: Why is it hard to create a timeline of events chronicling Earth’s History?

A: There are timeliness but they are often conjectured and who can argue with them with an alternative.…

Q: Describe in your own words how the Earth’s layers were formed

A: Earth is the planet on which we live.

Q: Which situation is most likely an example of convergent evolution? a. Squid and humans have eyes…

A: Convergent evolution  can be defined as the process where the organisms not closely related not in…

Q: The term “Cambrian explosion” refers to (a) an increase in biodiversity. (b) a mass extinction. (c)…

A: Answer: Introduction: The Cambrian explosion or Cambrian radiation was an incident about 541 million…

Q: Analyze the following data table indicating the amount of Carbon Dioxide in Earth's atmosphere at…

A: Earth`s temperature is in direct correlation with the levels of CO2 which is the primary greenhouse…

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: 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: describe 3 characteristics that make e

A: The third planet from the sun is the earth. And 29.2% surface of the earth is land and the remaining…

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: Before the emergence of life of what gases was the earth's primitive atmosphere constituted?

A: the primitive atmosphere was reducing in nature it had little or no oxygen  it was rich in water…

Q: Which of the mass extinctions was the largest? What percentage of life went extinct during that…

A: Mass extinction is defined as the dis-appearance of a large scale of biodiversity (animals +plants…

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: In birds, where have most of the recent extinctions taken place?   a. In outer space   b. At sea…

A: Extinction: It is the term that tells about the disappearance and ending of the species due to their…

Q: On the geologic time scale, life originated in the_____ . a. Archean c. Phanerozoic b. Proterozoic…

A: The geologic time scale is a chronological dating system that classifies geological strata into…

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: Energy, the absence of molecular oxygen, chemical building blocks, and time were the requirements…

A: The change in the traits and characteristics of the population with time is termed evolution. The…

Q: The greatest mass extinction episode in the history of life occurred at what boundary? (a)…

A: Mass Extinction events can be defined as those events in which half or more than half of all…

Q: Which of the following pieces of evidence prompted researchers to abandon the hypothesis that a…

A: Iridium is an element belong to the platinum group and is the rarest and most densest element. Its…

Q: According to the land bridge theory, why may people have crossed into North America from Siberia?

A: Landbridge theory, states that early animals and people traveled from Siberia to Alaska across a…

Q: The fossil record shows that in just the last 600 million years, there have been five instances of…

A: Explanation: The most studied mass extinction, which marked the boundary between the Cretaceous and…

Q: Did the five Big Extinction events in earth's history all occur due to the same environmental cause?

A: There have been five significant mass extinction events in Earth's 4.6 billion-year history, each…

Q: Describe the conditions that scientists think existed on early Earth.

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

Q: .Who among these evolutionary thinkers stated that the living forms come from the seas? a. Erasmus…

A: Introduction Evolution:- It is simply the biological change of a species over a span of time or the…

Q: Describe what the early atmosphere was like and what cause a large amount of oxygen (O2) to build up…

A: Early atmosphere  Around 4.6 billion years ago, the Earth was formed from a heated mixture of gases…

Q: Assuming that the early lithosphere had already been created, which sphere (the atmosphere or the…

A: Introduction The Stiff, Outermost Shell Of A Terrestrial-type Planet Or Natural Satellite Is Called…

Q: Which of the following is characteristic of the end of the Paleozoic Era? a There was a mass…

A: As experts believe, the Earth was formed as a result of the Big Bang Explosion. The geological time…

Q: The fossil record provides evidence for:    A.When organisms lived on earth   B. How some species…

A: The fossil record is the story of life's development as preserved in sedimentary rock by fossils,…

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: Which of the following do not provide evidence that a meteor strike was a partial cause of the…

A: About 65.5 million  years ago KT extinction event occurred which wiped off the dinosaurs from the…

Q: Which of the following theories as regards the origin of life on earth is accepted today? A. Theory…

A: The origin of life on earth is known to arise from the non-living matter, organic compound. The…

Q: Could the First Biological Molecules Have Formed NearVolcanoes on Early Earth?

A: In 1953, Stanley Miller conducted an experiment in the laboratory of Harold Urey to understand the…

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: Arrange these events in order of occurrence, with 1 being the earliest and 6 the most recent. First…

A: From the time earth came into existence, till now, our planet has gone through several changes.…

Q: Which of the following evidence was used by Wegener to support his hypothesis that the conti- nents…

A: Alfred Wegener is a German scientist who proposed a hypothesis called Continental drift in the early…

Q: We live in the Cenozoic era, and scientists know more about this era and the epochs it’s divided…

A: The term 'Cenozoic' refers to a period of time ranging from 66 million years ago to the present day.…

Q: Scientists are examining the possible role of a large asteroid in the cretaceous mass extinction…

A: Introduction :  Small, airless rocky bodies revolving around the sun between the orbits of Mars and…

Q: A. How old is the Earth? B. How long did the longest eon (so far) last? C. How many years ago did…

A: Epoch is longer than era. Eon is the longest period of geological time.

Q: List three locations where the building blocks of Earth’s first lifemay have formed

A: The biological event through which life has originated from non-living matter, like simple organic…

Q: Approximately when did life first appear on land A. 500 million years ago B. 2 billion years ago…

A: Question - Approximately when did life first appear on land A. 500 million years ago B. 2 billion…

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…

Q: One type of fish fossil is found only in a rock layer near the bottom of a canyon, while a different…

A: Stratigraphy is the study of the rock layering and reveals a wealth of information about what Earth…

Q: What type of plates that float on top of the mantle do scientist believe that the Earth's crust is…

A: The earth is made up of different layers: 1)The Inner core- It is the inner and hottest layer of the…

Prokaryotic evolution

The term evolution means the gradual change or a transformation from a simple or primitive state to a complex or advanced state. Prokaryotic evolution is a concept that involves the evolution of the form and function of most primitive organisms (prokaryotes) through several stages and changes to form diverse life as a part of organic evolution.