Which eon has more events occurring in it? During which eon did life evolve? What is the difference between background extinctions and mass extinctions?

Q: A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive…

A: Earlier, paleontologists were only able to understand biological succession, they weren't aware of…

Q: If a sixth extinction event is occurring, how is it similar or different from the previous five mass…

A: Various mass extinction events that occurred in the history of the earth are- Ordovician-Silurian…

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: Question 1:  Mass extinction ocurred on the following time and era except for: A. Mesozoic B.…

A: Question 1) Mesozoic era : At the end of this era the about 70% of all plants and animals were…

Q: Table 1 Millions of Years Ago (Mya) Event First humans (genus Homo) The Origin of the Earth First…

A: According to astronomical research and geological evidence, scientists indicate the universe is…

Q: what is mass extinction?

A: Dear student:- Answer:- A mass extinction is typically described as the extinction of roughly…

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: What argument convinced most scientists in the 1800s that Earth was more than 6,000 years old?…

A: Fossils are the remains of the organisms that were present on the earth in the past.

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: What is a mass extinction?  What makes the 6th mass extinction that is happening right now different…

A: Mass extinction is when a species vanishes or goes extinct much faster than they are replaced.  It…

Q: Adaptive radiations can be a direct consequence of three of the following four factors. Select the…

A: Introduction Adaptive radiation is a force in which organisms rapidly develop from an ancestral…

Q: Four billion years ago, the Earth was a thin-crusted inferno. Which probable stage of physical and…

A: Solar system was originated around 4.6 billion years ago from contraction of rotating gas and dust…

Q: List several significant events in the history of life on earth that are associated with the K-T…

A: KT boundary is the boundary between the age of reptiles that occurred in the Mezoxoic era and age of…

Q: What is the “sixth mass extinction event”?

A: Mass extinction refers to a substantial increase in the degree of extinction or when the Earth loses…

Q: When was the first mass extinction?

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: How many mass extinctions have occurred total? List several possible causes.

A: Extinction is defined as the extermination of a species from the earth. Species extinction is caused…

Q: Which of the following is associated with the Cenozoic era? O a. Warmer planet O b. Different…

A: The answer is given below:    The first two are associated with the Cenozoic era.

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 name for the process in which one species evolves in response to the evolution of…

A: Evolution is a process through which cumulative changes occur in a population at the genetic level.…

Q: What argument convinced most scientists in the 1800s that Earth was more than 6,000 years old? O The…

A: Introduction All life on earth began from the universal last common ancestor which lived 3 to 4…

Q: Which of the following was NOT evidence that Wegener found to support his continental drift theory?…

A: This theory mainly explains how the different continents shift positions on earth surface.

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: Describe one of the major extinction events during the Late Paleozoic or Mesozoic (include when it…

A: Description of the major extinction event occurred in late paleozoic Or medozoic era.

Q: What led Walter to study the mass extinction of the dinosaurs? O He was following in the footsteps…

A: Paleontology, sometimes called palaeontology or palæontology, is the research of life which lived…

Q: According to the most recent evidence, the first modern Homo sapiens evolved in Africa around…

A: Homo sapiens are the most recent species of human lineage.  They were evolved in sub Saharan Africa.…

Q: How is a mass extinction event indicated in the Tree of Life? Significant gaps on the tree are…

A:

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 term Anthropocene implies that

A: Epoch, in general, termed as a very important period of time in history

Q: Do you believe were in a mass extinction period right now? Why or why not?

A: A mass extinction is when species are lost much faster than they are replaced.  75% of the species…

Q: What is the role of mass extinctions to evolution?

A: An extinction event is a significant and rapid loss of biodiversity on the planet. A major shift in…

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: 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: What are some of the hypothesized causes of Earth’s biggest mass extinctions?

A: A mass extinction is typically described as the extinction of roughly three-quarters of all species…

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: Fill in the blanks. The parentheses after the blank represent the choices for each blank.…

A: Gondwana was the ancient supercontinent which existed millions of years ago. At that time, primitive…

Q: Is extinction normal? Explain. What is NOT normal about it now? Why is the loss of biodiversity so…

A: Extinction: [normal]            Extinction serves as a normal part of evolution, where it has been…

Q: On the right is a hypothetical tree of life. Where on the tree is LUCA (the last universal commor…

A: Cladogram --  Cladogram is a diagrammatic presentation of relationship between species.  It can also…

Q: What is our current eon ______________, era _______________, and period _______________   Age…

A: Since multiple subparts are posted so first three subparts have been answered.  The geologic time…

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: 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: how organisms evolved through time. What are pressures that caused the evolution of these organisms…

A: Evolution is the biological changes that occur in a population over a period of time.

Q: WHAT IS MASS EXTINCTION? HOW DID MASS EXTINCTION EVENTS INFLUENCE EARTH'S HISTORY?

A: Extinction is the termination of a kind of organism or of a group of kinds, usually a species.

Q: There have been five main mass extinctions. Match each mass extinction event to its description. 1.…

A: Introduction  Extinction is the death of a type of organism or a group of organisms, most commonly a…

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: Because mass extinction is a natural process that may facilitate evolution during the period of…

A: When species disappear far quicker than they are replaced, it is called a mass extinction event.…

Q: Describe the conditions on Earth 4.5 billion years ago

A: Evolution is the process of slow gradual change over a period of time. The process of evolution…

Q: Which of these is evidence that we are in a mass extinction event? O The extinction rate of…

A: Earth has gone through at least five major mass extinction events, one of which is the famous…

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

A: ANSWER;- OPTION  C is correct ( after the asteroid strike).

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.