The largest and most deadly of all Mass Extinctions in the history of Earth came at the end of the Period, when only 5% of the existing species survived. Nobody knows exactly what caused this event, so it remains a mystery to this day. Quaternary Devonian Ordovician Permian

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: Geologic changes often accompany mass extinction of life forms. Why do you think this is true?

A: Introduction:- To understand this question first we need to know what is mass extinction and major…

Q: One of the biggest puzzles for modern evolutionary biologists is the rate of adaptive radiation that…

A: INTRODUCTION Adaptive radiation The period where there is increased biodiversity and speciation is…

Q: Cuvier's idea of catastrophe related to asteroid collisions understanding that geological change…

A: Theory of catastrophes by George's Cuvier According to this theory, fossil show that animal and…

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: Event How Long Ago? # Organisms Extinet Causes Cretaceous

A: Cretaceous extinction :  Cretaceous extinction took place about 66 millions ago . Organisms which…

Q: In which era of the Geologic Time Scale are we currently living ir O Cenozoic O Mesozoic

A: 2nd answer is cenozoic

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: The appearance of the first hominoids dates to the ___________ period. Triassic Jurassic Cretaceous…

A: A hominid refers to a group of human and human-like apes which belongs to the Hominidae family. The…

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: 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: 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 greatest mass extinction episode in the history of life occurred at what boundary? (a)…

A: Mass Extinction events can be defined as those events in which half or more than half of all…

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: Which era is furthest in the past? O A. Cenozoic O B. Mesozoic O C. Paleozoic O D. Precambrian

A: According to the timeline of the evolutionary history of life, all present-day organisms have been…

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

A: To explain: The reason why only few remaining samples of these early rocks still remain on the…

Q: Which of the following is the best way to measure the age of the Earth? O Examine rocks collected in…

A: Test the rate of decay of specific elements in rock samples

Q: The eon comprising the Cambrian period up to the present is called the (1). It is divided into three…

A: Geological time scale is the calendar for events in the Earth history. It is subdivided into eons,…

Q: The fossil record (a) usually occurs in sedimentary rock (b) sometimes appears fragmentary (c) is…

A: All life on Earth descended from the universal last common ancestor, who lived between 3 and 4…

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: 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: Equater Permian - 225 million years ago Triassic - 200 million years ago Jurassic - 135 million…

A: Introduction Twenty million years ago the Indian and Asian continental plates clashed and pushed up…

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: Which of the following events did NOT occur during thePrecambrian?a. Formation of the ozone layerb.…

A: Introduction The Precambrian Period, which predates the current Phanerozoic Eon, is the earliest…

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: 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: 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: 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: 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: (Modified True or False) Fossilized organisms are forms of organic carbon that are buried and stored…

A: A fossil is a preserved remains of animals and plants that are buried in sediments.  It is formed…

Q: In undisturbed sedimentary rock, strata from the _ period are immediately below rocks from the…

A: Relative dating is the science of interpreting the relative order of events that occurred in the…

Q: Period was of unique importance to all ause during this Period aquatic vertebrates, like lobe finned…

A: Answer. Geological time scale is a chronological sequence of geologic and evolutionary events…

Q: Mammals quickly diversified into their various recognizable forms (i.e. cats, dogs, bears, ocean…

A: The group of vertebrate animals that are characterized by the presence of mammary glands is termed…

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: 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: 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: 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: Which of the following shows the correct sequence of periods in the Mesozoic era: a) Triassic,…

A: Evolution is a change in species and organisms that are inheritable and can be transferred from…

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

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

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.