Which of the following is not thought to have been a source of organic molecules on early Earth?* O Meteorites Radiation from the sun O Cosmic dust Hot water near volcanoes

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: One of the prerequisites for chemical evolution on early Earth is that there was an adequate amount…

A: Early earth is not rich with oxygen until photosynthetic bacteria arrived after that oxygen levels…

Q: In Miller’s original experiments on chemical evolution, which of the following molecules (gases) is…

A: When Earth formed 4.6 billion years ago from a hot mix of gases and minerals, it had almost no…

Q: Many scientists claim that the synthesis of the first organic molecules from inorganic precursors…

A: Null hypothesis is a statement which is based upon certain observations and facts.

Q: How do organisms form carbon films? O Organisms turn into rock. Residue is left on rocks when…

A: A thin-film coating that is composed predominantly of the chemical element called carbon is termed…

Q: Understand the importance of the Miller-Urey experiments that recreated the conditions present in…

A: Stanley Miller and Harold Urey demonstrated in their experiment that UV radiations or electric…

Q: The heaviest elements during the Earth’s formation were what?  What part of the Earth did they form?…

A: The structure of the earth is divided into four major components: the crust, the mantle, the outer…

Q: Which of these did Stanley Miller place in his experimental systemto show that organic molecules…

A: Answer- S.L. Miller experiment concluded the thoery of chemical evolution. He used all the inorganic…

Q: Which of the following techniques examines the decay of carbo an object? O A. Radiometric dating O…

A: For the determination of the age of living or nonliving materials the scientist usually determined…

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: Direct evidence of life on early Earth comes from fossils of microorganisms that lived 3.5 billion…

A: The earliest life structures we are aware of were minuscule organic entities (microorganisms) that…

Q: Which of the following events occurred earliest in Earth’s history? a. Membrane-enclosed structures…

A: Recognizable human beings appeared on a geological scale at most 2 million years ago, a vanishingly…

Q: During the first 600 million years of Earth history, enzymes, ATP , and other molecules could have…

A: The primitive earth was in the form of a red hot, solidified cloud containing free atoms. The…

Q: The Precambrian (before Cambrian) time period includes many eons. This period of time includes the…

A: Answer. The Precambrian (before Cambrian) time period includes many eons. This period includes the…

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 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: Radiometric decay of carbon-14 would be used in dating sedimentary rock. a trace fossil. an insect…

A: Radiometric decay is a method dating substances of possible majority of organic content. Principle:…

Q: One of the prerequisites for chemical evolution on early Earth is that there was an adequate amount…

A: on the early earth, there had much time to generate a suitable condition which may lead to the…

Q: Imagine you were to find a fossilized animal bone containing one-eighth the amount of carbon-14…

A: Given information: Carbon-14 present in the fossil is 1/8th of the earth's atmosphere today. The…

Q: Martian meteorites found in Antarctica were determined to possibly contain life. Scientists looked…

A: Known as ALH 84001, the Martian rock whose remains were present in meteorites contained structures…

Q: State in what ways Stanley miller simulated the condition of :-i) Primitive atmosphere on earth.ii)…

A: Stanley miller performed an experiment to prove that organic molecules were produced by the…

Q: A fossil is found to contain the radioactive parent and daughter isotopes uranium 235U, and lead…

A: INTRODUCTION The determination of the relative age of a rock is predicated on the principle of…

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: 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: 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: What did Wegener call the giant land million years ago? Pangaea O Big Ol' Continent Gigantia…

A: The supercontinent began to break apart about 200 million years ago, during the Early Jurassic Epoch…

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: I. Formation of Planet Earth (- BYA) : derived from the : incandescent and largely : as temperature…

A: Formation of planet earth 4.5 billion years ago : derived from the Solar nebula : incandescent and…

Q: what element rise that caused the diversification event in evolution of earth

A: Introduction : The rise in oxygen, which is termed the Great Oxygenation Event is an important event…

Q: an abundance of ______________ in earth's early atmosphere would have interfered with assembly  of…

A: Organic molecules are molecules found in all the living organisms. These molecules are formed by a…

Q: With the above scenario in mind, discuss the significance (to life on earth) of the original…

A: The invention of oxygenic photosynthesis was a small step for bacterium, But a giant leap for…

Q: (e) If you collected a sample of water being ejected from Saturn's moon, Enceladus, you could…

A: A sample-return mission is a spacecraft mission that collects and returns samples to Earth for study…

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: Choose the word that corresponds to the definition. v A chemical that contains a carbon double…

A: Since the words are missing answers are from a general prospective.    Biology is the branch of…

Q: Which staterment from the choices below, BEST describes scientists current understanding of the…

A: Methane, ammonia, water vapour, and the noble gas neon were abundant in Earth's initial atmosphere,…

Q: Studying the decay of radioactive isotopes in dead organisms helps scientists to identify fossilized…

A: In the decay of radioactive isotopes after the death of an organism, there is radioactive…

Q: a) With the above scenario in mind, discuss the significance (to life on earth) of the original…

A: a) Photosynthesis is the process in which green plants utilize water and carbon dioxide to generate…

Q: Stanley Miller showed experimentally that inorganic gases could form simple organic molecules…

A: The Miller-Urey experiment provides an evidence for the hypothesis supporting chemical origin for…

Q: Which of the following is not a fossil?a. Dried-out animal bones in a layer of desert sandb. A patch…

A:

Q: During the Paleozoic, many life forms developed hard parts (shells/bones/etc.).  Why would it be…

A: Shelled animals, the majority of which are sea-based, come in a wide range of shapes and sizes.…

Q: The earth is about 4.6 billion years old. Based on the formation of seafloor spreading, why do you…

A: The newest, thinnest crust on Earth is located near the center of mid-ocean ridge—the actual site of…

Q: Because it's most resistant to deterioration, which type of molecule is most often found in…

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

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: The largest and most deadly of all Mass Extinctions in the history of Earth came at the end of the…

A: If we observed the geological time scale then we can see different evolutionary events occurs…

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: Based upon our current understanding of the abiotic origin of life, which of the following molecules…

A: Abiogenesis is the generation of life from nonliving matter. It is now more precisely known as…

Q: With the above scenario in mind, discuss the significance (to life on earth) of the original…

A: Photosynthetic bacteria are the group of bacteria that uses the photosynthesis process to generate…

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…

Human Evolution

Human evolution is the process of evolution of humans from early man to anatomically modern humans. The process of evolution in humans leads to the gradual development of traits like bipedalism. Humans are the highly social animals that make them the most advanced animal on Earth.  Human evolution is an outcome of interaction among the following processes: