Martian meteorites found in Antarctica were determined to possibly contain life. Scientists looked skeptically at these meteorites because   a. their results suggest unusual chemical signatures that do not indicate life.   b. features thought to

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: The period of the history of the earth that is referred to as Chemical Evolution was essential for…

A: Chemical evolution explains how life started on Earth. Chemical evolution refers to changes in…

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: 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: 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: 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: Researchers looking for fossils of the earliest life-forms face many hurdles. Explain why so few…

A: Fossils are the preserved remnants of ancient creatures or evidence of their remains. Fossils are…

Q: How might radiometric dating provide support for the theory of evolution by natural selection?

A: Hi! As you have posted multiple questions, I will be answering the first question for you. If you…

Q: Which of the following describes the organisms and/or processes that were most influential in the…

A: The earth is one of the eight planets revolving around the sun. It is estimated that earth have been…

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: 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: What did the biology experiments on the Viking landers discover? A. Although Mars's soil is…

A: The Viking Program consisted of two American space probes, Viking 1 and Viking 2, that were sent to…

Q: 9) Rocks containing fossil evidence have been found in Canada suggesting how life on Earth evolved.…

A: They are the remains of an organism that are preserved. They can be found as traces of ancient…

Q: Which of these geologic time periods have been defined by a major extinction event? Select all that…

A: Ans. Mass extinction is the episode in which, during relatively short geological times, a large…

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: Which of the following was probably the least important factorin bringing about the Cambrian…

A: The Cambrian explosion is also known as the Cambrian radiation. The Cambrian Period existed…

Q: Fossils are remains of ancient organisms found in the rocks are categorized depending on their age.…

A: The remnants and evidence of ancient species are known as fossils. The preserved remnants or traces…

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: 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: Relative-Age Dating Absolute-Age Dating Younger 440 mya 480 mya 520 mya 545 mya Older 2. The dates…

A: Ans: C: Igneous rock layers

Q: radiometric dating

A: two isotopes of uranium are used for radiometric dating . uranium -238 decays to form lead -206 with…

Q: Indicate which of the following statements concerning biostratigraphy is true. a) fossils can only…

A: C. fossil can only be dated in ancient oceanic sediment layers is correct.

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: How does finding the same fossils of a land animal on two different continents support the…

A: Continental drift Alfred Wegener developed the hypothesis of the continental drift in the early 20th…

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: 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 Cambrian Explosion occurred approximately 542 million years ago. During the Cambrian, what…

A: Cambrian explosion, took place between 541 million and approximately 530 million years ago. This…

Q: A. What is the PROTEROZOIC LIFE? B. Discuss the Great Oxygenation Event. C. Discuss the CAMBRIAN…

A: Geological time scale is a evolutionary event  which determines how the life appear , its…

Q: Which of the following are useful for reconstructing ancient environments? Group of answer choices…

A: Option 1 is correct because glacial ice contains dust, air bubbles, or isotopes of oxygen that can…

Q: Radioisotopes are useful in dating fossils and rocks because

A: Fossils  They are remains of animals which are preserved in ice or in deep underground or inside…

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: An organism dies,and its body leaves an impression in mud. Over time, the mud hardens into rock, and…

A: The cells are the primary unit of life. Based on the number of cells an organism may be unicellular…

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: Imagine you are the head of a newly formed NASA Interplanetary Paleontology Department! Based on…

A: Fossils are the impressions of the preserved impressions of organisms that remained on this planet…

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: Which mechanism of fossil formation created a replica of an organism's original form? a natural…

A: Introduction When an organism is buried via water that contains debris and minerals, in addition to…

Q: Oparin-Haldane hypothesis

A: Answer:

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: 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: at is the term for an element that decays into another O A. Sediment O B. Mesozoic O C. Radioactive…

A: This is the physical phenomenon of certain elements of emitting energy in the form of radiation.

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: 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).

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…

Q: The Miller-Urey experiment was a landmark step in our understanding of the origins of life. But what…

A: Introduction Stanley Miller and Harold Urey devised a test to put Oparin and Haldane's theories to…

Paleontology

A branch of science concerning the scientific study of life from ancient times is known as paleontology. The scientists working on paleontology are known as paleontologists. Paleontologists collect the fossils of organisms from ancient times to classify them. The paleontologists also study the environment from ancient times to study the interactions between different organisms.