During what geologic period did life on Earth begin?

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: Once life began, what types of organisms lived on Earth forthe next two billion years? Where did…

A: Introduction There are several hypotheses presents on that how life starts on the primitive earth.…

Q: Geologic changes often accompany mass extinction of life forms. Why do you think this is true?

A: Introduction:- To understand this question first we need to know what is mass extinction and major…

Q: Which organisms came and went during the Mesozoic era?

A: MESOZOIC ERA:- It is the era when the conifers, reptiles, dinosaurs were present in plenty of…

Q: How did life first begin on Earth?

A: The Earth was created about 4.5 billion years ago. Scientists and researchers believe that the…

Q: How did Paleozoic life diversify during the Ordovician, Silurian,Devonian, Carboniferous, and…

A: Evolution is the change in the characteristics of a species over several generations and relies on…

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: Whose discovery made the dating of ancient materials possible?

A: Radiocarbon dating works by comparing the three different isotopes of carbon. Isotopes of a…

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: Which of the following eras in Earth's history is the longest? Precambrian Cenozoic Paleozoic…

A: A geological era divides eon into smaller unit of time. Geological era are further divided into…

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: How does the fact that Earth is a sphere tilted on its axis influence thedistribution of life?

A: Earth is so far the only planet that has the capability to sustain life on it. There are many…

Q: What factors influenced the isotopic composition of oxygen in skeletons of marine organisms during…

A: The factors that influenced the isotopic composition of oxygen in the skeleton of marine organisms…

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: What Were the Earliest Organisms Like?

A: Evolution is a gradual process, and according to the theory of evolution, all species are related…

Q: Has the number of species on Earth increased steadily since the origin of life?

A: Ans: Species: The species are those which are capable of interbreeding and producing the offspring.…

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 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 were biomolecules likely to have formed on the early Earth?

A: The fundamental biochemical similarities that were observed in living organisms have developed…

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: 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: 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: Given the life-style we live today, what pre-historic period gives us the ability to heat our homes,…

A: the ability to heat our homes, run our cars, and have a comfortable life was the ability of humans…

Q: What period did modern humans evolve?

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

Q: Rock strata with fossils Which organism is most recent? a b d a

A: Fossils These are defined as the remains of organisms such as plants, animals, single-celled living…

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: The ends of many eras and periods in the geologic time scale are characterized by?

A: Introduction: Paleontology is the study of the earth's history of lifeforms, which is based on…

Q: What's the earth crust?

A: Earth is a planet that is made up of the lithosphere, hydrosphere, and atmosphere. All of these…

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

A: John H. McClendon published the Origin of Life in 1999. There he mentioned the origin of the…

Q: How would you describe earth of millions year ago

A: It is believed that our planet Earth is about 4.54 billion years old.  About 3.5 billion years ago…

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 have changes in earths systems contributed to the evolution of life?

A: Earth and its environment are persistently modified. Plate tectonics move the landmasses, raise…

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: What is the relationship among eons,epochs and periodsbof geologic time scale? Explain

A: The geologic time scale splits the earth's evolution into periods depending on the types of life…

Q: During what era did pangs begin to break up

A: During what era did pangs begin to break up? Answer. B. Triassic

Q: Which event in Earth’s historyeventually lead to the evolution of multicellular lifeforms?

A: The process of evolution of multicellular life from simpler, unicellular microbes was an important…

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: What are the divisions of the geologic time scale?

A: Paleontology is the study of prehistoric life using fossil evidence or ancient sediments. This helps…

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: How are the different periods in the history of the earths broken up?

A: Evolutionary biology is the branch of biology that deals with the study of evolution or orderly…

Q: How do sedimentary rocks form?

A: There are three major rock types including igneous, metamorphic, and sedimentary rocks. Among these,…

Q: How do we know when oceans were first present on Earth?Why is the presence of oceans significant to…

A: The water body, which consists of hydrosphere of different planets, is called oceans. The 71%…

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…

Marine Evolution

Marine habitat is less explored, and hence, its biological diversity is far less known. The marine habitats are not constant due to their shifting nature, while the terrestrial habitats are more stable. Marine biology is the science that deals with the study of diverse marine species, their interactions, and behavioral characteristics.