Researchers looking for fossils of the earliest life-forms face many hurdles. For example, few sedimentary rocks date back more than 3 billion years. Review what you learned about plate tectonics in Section 16.5. Then, explain why so few remaining samples of these early rocks remain.

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: Scientists who study forms of marine life that lived more than200 million years ago usually obtain…

A: Scientists who study forms of marine life that lived more than 200 million years ago usually obtain…

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: 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: What do you think geologists would find in the rock record as evidence of human life today million…

A: Millions of years later, layers of sediment will get compacted into rock such as sandstones,…

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: 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: Relative dating of sedimentary rocks allows scientists to assign specific dates to fossils.

A: It is difficult to date sedimentary rocks since they range to billions of years ago. So, the…

Q: Using tables 2.1 and 2.2 as references, fill out the following table. The first item is given as an…

A: Geological time scale Geological time scale is a representation of Earth's history.

Q: Which fossil layer is the youngest (name the geological period)?

A: The Cenozoic fossil layer is the youngest among the three layer.

Q: If original tissues of organisms are buried in the absence of ________ for long periods of time,…

A: Advent of Fossil:                  Fossils were the immortal remains of few parts of organisms,…

Q: Colonization of Land The Cambrian explosion Flowering plants Endosymbiosis Origin of Reptiles First…

A: Introduction : The Geologic Time Scale divides the Earth's history into four…

Q: Which of the following statements is incorrect in the context of fossilization? Minerals dissolved…

A: The process in which part or whole of animal or plant is being preserved in hard form is known as…

Q: Why are fossils from tropical rainforests (such as Brazilian Amazon) more rarely found than the ones…

A: Fossils- they are preserved remains of any living thing from the past. It can be an impression or…

Q: Fossils found in deeper layers of the Earth generally have ____ 14C than fossils found in the upper…

A: Fossils found in the deeper layer of the earth generally have which amount of 14C than fossils found…

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: Imagine that a species of flightless bird lived on the supercontinent Laurasia during the Jurassic…

A: The movement of tectonic plates in the geological time resulted in the splitting of single landmass…

Q: The theory of evolution is supported by a large body of evidence. What is the first occurrence of…

A: The theory of evolution The theory proposes the idea that all species present are related and have…

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: 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: Biologists most often use ____________ for radioisotope dating, but its half-life is relatively…

A: Fossils are organized sequentially can give information about evolutionary connections among…

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 time of greatest evolutionary diversification in the history of life occurred during the (a)…

A: Introduction  Environment plays a major role in the diversification of organisms. For example, if we…

Q: Describe the roles that montmorillonite clay and vesicles may haveplayed in the origin of life.

A: The origin of life (OoL) on Earth is a natural mechanism. Life conquered the Earth about 3.7 billion…

Q: Which of the following geologic and biologic events defined the Carboniferous period?   The age of…

A: The Carboniferous Period lasted from about 359.2 to 299 million years ago* during the late Paleozoic…

Q: Earth is about 4.5 billion years old. In order to characterize the events that happened in this very…

A: Geological time scale can be defined as sequence of geological events happened in the history of…

Q: In which era did humans first appear on Earth? O A. Paleozoic O B. Mesozoic C. Precambrian O D.…

A: Humans do not evolve from the todays chimpanzees but human develop along side with the chimpanzees…

Q: Scientists on a fossil expedition in the Florida Everglades excavated an area with four strata…

A: Fossils are a good way to study various aspects of evolution and various genetic lineages the help…

Q: Flowering plants and mammals diversified and became dominant during the (a) Paleozoic era (b)…

A: Flowering plants are the angiosperms that produce flowers as organs of sexual reproduction.

Q: Researchers looking for fossils of the earliest life forms face many hurdles. For example, few…

A: Fossils  Fossils are the imprint or undecayed part of dead organism or some parts of dead organism…

Q: Table 10: Some Important Events in Geologic Time Era Period Triassic Epoch Event Age of Reptiles…

A: * Modern mammals have evolved from preceeding animals . * Formation of modern humans from azoic era…

Q: Figure 5 illustrates the distribution of fossils in undisturbed layers of silt at the bottom of the…

A: Fossils are the remnants of the living organisms that lived in past.  The parts of organisms like…

Q: Which fossil layer is the oldest (name the geological period)?

A: When geologists study 3 rock layers (and their fossils), there is a good chance that the upper layer…

Q: Directions: Using the Geologic Time Scale, copy and complete the table below by supplying the blank…

A: Paleozoic era The era of ancient life began around 544 million years ago, when creatures formed hard…

Q: Researchers looking for fossils of the earliest life forms face many hurdles. For example, few…

A: Hello. Since you have posted multiple questions and not specified which question needs to be solved,…

Q: The Cambrian Explosion occurred due to the widespread adoption of bilateral symmetry and the…

A: The Cambrian explosion is a very important event in the studies of evolution and adaptation. This…

Q: Over geologic time, the concentration of 02 in Earth's atmosphere has increased. However, at the end…

A: Carboniferous period which is part of late Paleozoic era is associated with large underground coal…

Q: During what era did pangs begin to break up

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

Q: In which type of rock are you most likely to find a fossil? a. basalt, a dark, fine-grained volcanic…

A:

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: A. Crossword on Earth's Record of Life Directions: Use the clues to answer the crossword puzzle. The…

A: Fossils are preserved remains of plants and animals whose bodies were buried in sediments. Fossils…

Q: most recent mass extinction, occurred about 251 million years ago. What is the leading hypothesis to…

A: Permian extinction occurs about nearly 251  million years ago,it results in the vanishment or…

Q: example. Table 10: Some Important Events in Geologic Time Era Mesozoic Period Triassic Event Eon…

A: This table is based on the time line of genetics.  Various animals and plants came into existence…

Q: The Image shows four fossils found in varlous layers of rock. Fossil A Fossil B Fossil C Fossil D…

A: Fossils are the evidences for the history of the life on earth, the remains of a organism or any…

Q: A. Direction: Choose the letter of the correct answer and write the letter only on the space…

A: 1. Answer of question 1 is right 2.Answer of question 2 is wrong cenozoic era is the age of mammals…

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.