Table 1 Millions of Years Ago (Mya) Event First humans (genus Homo) The Origin of the Earth First eukaryotes First grasses K-T boundary mass extinction First plants on land First flowering plants

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: What triggered the Cambrian explosion that started 541 million years ago? All of the above O Higher…

A: Cambrian explosion refers to an event that occurred in the Cambrian period about 541 million years…

Q: Plate tectonics were a major factor in shaping life on this planet. Explain how plate tectonics can…

A: Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide…

Q: llowing with one sentence each question. 1. What do you know about the history of your selected area…

A: Answer

Q: Which is one a force of evolution? Deletion Natural Selection Photosynthesis Electrophoresis It is…

A:

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

A: Geologic Time Scale:- A record of the life forms and geologic events in. Earth's history. Scientists…

Q: Fossil Record: Transitional Fossil: Vestigial Structure: Biogeography: Homologous Structure:…

A: Any preserved remains, impression, or trace of any once-living thing from a past geological age is…

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: Event How Long Ago? # Organisms Extinet Causes Cretaceous

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

Q: A plant evolves a high level of poison that enables it to defend itself against insects. Soon an…

A: Evolutionary developmental biology is considered a new norm in evolutionary biology. It arose from…

Q: The 6th (Holocene) mass extinction is mostly the result of human activities. O True O False

A: Mass extinction refers to the loss of biodiversity on a large scale due to massive extinction of…

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: An evolutionary biologist is studying the relationship between fish species. She studies undisturbed…

A: After the Pacific Ocean, the Atlantic Ocean is the world's second largest ocean, covering 25% of the…

Q: 1. The woolly mammoth lived from the Pliocene to the Holocene time period. Compare the temperature…

A: Answer: TEMPERATURE: It is the measure of the level of heatness and coldness.  It  can be measured…

Q: over successive generations. O Habitat formation Secondary Succession The theory of evolution A…

A: Evolution, a change in the genetic makeup of a subgroup, or population, of a species. Every living…

Q: E. Evidence from Biogeography Biogeography is the study of geographical distribution of fossils and…

A: Continental drift is a theory that explains the shift of continents position on the earth's surface.…

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: Why was it believed that life began in the seas and not in land or air? * Land and air were…

A: Option a is correct  Land and air were inhospitable places for life during the archean eon.

Q: Scientist have determined that the early Earth had no free oxygen anywhere. Briefly explain what…

A: Scientists suggest that the early atmosphere of the earth was very hot and had no ozone or free…

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: Humans have been around for only about years of the planet's 3.8 billion years in existence. 90,000…

A: Approximately 6 million years ago, a primate group known as Ardipithecus formed the first vital…

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: 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: The ends of many eras and periods in the geologic time scale are characterized by (1). These events…

A: My extinction is defined as the disappearance of species faster than they can be replaced by the…

Q: Adaptive radiation

A: Evolution evolution is a process by which organisms adapt and grow to serve better in their natural…

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: Do you believe were in a mass extinction period right now? Why or why not?

A: A mass extinction is when species are lost much faster than they are replaced.  75% of the species…

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: Arrange in chronological order the evidence that life transitioned from aquatic environments to…

A: Introduction In contrast to land-based terrestrial ecosystems, an aquatic ecosystem is one that…

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: The largest mass extinction on record is the mass extinction event. O Late Permian O Late…

A: According to law of superposition within a sequence of layer of sedimentary rock the oldest layer is…

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: 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 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: 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: 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: 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: The first self replicating RNA molecules likely evolved sometime during the Eon. Archean Hadean…

A: Evolution is defined as the process by which living organisms acquire and transfer novel traits from…

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: Below is a type of evolutionary tree. Which species is O closely related to?

A: Evolutionary trees are models that seek to reconstruct the evolutionary history of taxa i.e.,…

Q: Archaic humans appeared as early as ___________ years ago. (a) 5 million (b) 1.2 million (c) 250,000…

A: A multitude of Homo species co-existed starting around half a million years ago, and they are lumped…

Q: The reason we are able to fuel our cars and power our cities is due to the absence of certain…

A: The Carboniferous was a time of marine invertebrates with many different forms. Carboniferous period…

Q: Information molecule to get evolved first on the primitive earth was : (1) Protein (2) DNA (3) RNA…

A: Introduction: DNA, RNA, or protein are referred to as information molecules because they participate…

Q: Which of these is evidence that we are in a mass extinction event? O The extinction rate of…

A: Earth has gone through at least five major mass extinction events, one of which is the famous…

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.