Plant life first appeared on land during which of the following periods? a. Cambrian period b. Ordovician period c. Silurian period d. Devonian period

Q: Which statement about the Cambrian period is true? The first multicellular life appeared. Large land…

A: From the end of the preceding Ediacaran era 541;million years ago(mya) to the beginning of the…

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: In what way was the evolution of eukaryotic cells linked to the increase in the oxygen concentration…

A: Evolution is a continuous process and we are still evolving. Evolution is nothing but adapting to…

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: Ancient mammals became abundant during this period: a) Jurassic b) Triassic c) Carboniferous d)…

A: Mammals can be defined as the group of vertebrate animals  which constitutes  the class  of Mammalia…

Q: Plant photosynthesis transformed a very large amount of atmosphericcarbon dioxide into…

A: Answer is c.)  Carboniferous.

Q: At the end of which geological time period did the Starfish become extinct?

A: Biodiversity is diversity of various living organisms on the planet that it contains different types…

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

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

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: 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: 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: 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 current geological era is the ________.   Question 32 options:   Cambrian   Paleozoic…

A:

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: 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: 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: 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: 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: 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: Cenozoic Era

A: The Cenozoic era began about 66 million years ago and continues into the present, is the third era…

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: 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: You are a Triassic dinosaur. Which of the following would you have been able to do?

A: The Triassic period was a time of enhancement of land plants in which ferns were transcendent…

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: The fossil record provides evidence for:    A.When organisms lived on earth   B. How some species…

A: The fossil record is the story of life's development as preserved in sedimentary rock by fossils,…

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: 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: 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: Could the First Biological Molecules Have Formed NearVolcanoes on Early Earth?

A: In 1953, Stanley Miller conducted an experiment in the laboratory of Harold Urey to understand the…

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: During what era did pangs begin to break up

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

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: 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: Which of the following periods is the earliest during which animals may have appeared? a. Ordovician…

A: Extinction aids the evolution of life by making way for new species. The number of species going…

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 graph shows biological diversity through time, from the early Permian through the late Triassic.…

A: The earth's geological scale is divided into various eras starting with the formation of the earth…

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…

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.