When considering the entire period of time during which life on Earth has been evolving, we must look at: hundreds of millions of years millions of years billions of years thousands of years hundreds of years

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: 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: Place these events in the history of life on Earth in the order that they occurred. a. accumulation…

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

Q: 41. Below is a list of major events that occurred in the history of life. Write the letter…

A: The history of life traces the events that occurred in the formation of organisms on the earth. It…

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: 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: why do we conclude the universe is expanding

A: The expansion of the universe is the increase of the distance between two distant parts of the…

Q: Which method is used to assign numerical ages to events or materials? absolute dating half-life…

A: By measuring the radioactive decay of isotopes or the effects of radiation on the crystal structure…

Q: The first single-celled organisms on Earth probably evolved (a) 3,700 years ago (b) 3.7 million years…

A: Evolution is a process of slow and gradual change over a period of time. There are many pieces of…

Q: Name the study of possible life outside the earth.

A: Our universe is made up of millions of galaxies within which contain within itself billions of stars…

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: The current geological era is the ________.   Question 32 options:   Cambrian   Paleozoic…

A:

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: Name one or more common organisms that lived or lives during each of the three eras of geologic…

A: Answer: There are 3 main eras of geologic time : the Paleozoic, Mesozoic and Cenozoic era.

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: 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: What was the Earth like million of years ago?

A: Millions of years ago, there is no life on the Earth. The temperature of the Earth was scorching,…

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: Have we identified all life on Earth

A: Biologists have described and classified 1.7 million plants and animals as of 2010, less than…

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: ss the major subdivisions of Geologic Time and its contributions to civilization in 100 words each…

A: The  time interval occupied by the geologic history of Earth is known as geologic time. The geologic…

Q: The term Anthropocene implies that

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

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

A: Cosmic dust

Q: n Stanley Miller’s experiment to recreate the early Earth conditions that gave rise to life,…

A: The Stanley miller's experiment is also called miller-Urey experiment. It was a chemical experiment…

Q: Scientists Stanley Miller and Harold Urey set up an experiment modeling the environmental conditions…

A: Conclusion from stanley Miller and Harold urey experiment is:- Life assembled from chemical building…

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: Put the following hierarchical levels in the correct order representing the structured organization…

A: Introduction The level of organization of biological refers to the complexity of the various…

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: D Question 4 Which mass extinction led to the disappearance of the dinosaurs? O Triassic O…

A: The recurrent rise and disintegration of ice sheets and glaciers driven by the Milankovitch cycles,…

Q: Origin of Life List in a series of four or five steps the most likely scenario for the evolution of…

A: Evolution is a continuous process and we are still evolving. Evolution is nothing but adapting to…

Q: What's the largest unit of geologic time, lasting hundreds of millions of years? A. Era B. Eon C.…

A: INTRODUCTION Largest unit of geolic time lasting hunderds of millions of year are Eons.

Q: List in order of appearance the four stages of the origin of life and explain what was necessary to…

A: Evolution is the gradual changes occur in in living organisms over a long duration it is a very slow…

Q: Which of the following is not a unit of geologic time? A epoch millennium era

A: The geologic time scale is the “calendar” for events in Earth history. It subdivides all time in…

Q: Provide a brief discussion in support of the following statement: “RNA is believed to have played an…

A: DNA encodes RNA, which regulates protein synthesis. Proteins are responsible for the biochemical…

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: For a long time, it was believed that life originated from decaying matter. What is this theory…

A: For a long time, it was believed that life originated from decaying matter. This theory is known as…

Q: True or false. The supercontinent pangaea formed about four billion years ago.

A: A supercontinent is a landmass that contains most or all of the land on Earth. The landmass formed…

Q: When a radio-isotope in a fossil with a half-life of 4,000 years has been reduced to 25% of its…

A: Scientists use a clock to calculate the date a rock or fossil was generated in order to ascertain…

Q: Cuvier's idea of catastrophe related to global geological events such as earthquakes extinction of…

A: Baron Georges Cuvier was a great French naturalist and zoologist. Cuvier is also known as the father…

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: 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: 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: Which sequence of events accurately describes the history of the planet (from oldest to youngest)?

A: The history of our planet, Earth, started with the formation of the solar system. The solar system…

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: 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: 19.Approximately how old is earth? Group of answer choices a.about 4.567 billion years b.about a…

A: Fossils are dead plants and animals that have been preserved in sedimentary rock or other crust…