Question 1

The _______ of the Carboniferous included snails, scorpions, centipedes, insects, amphibians, and early amniotes

Accepted Answer

The answer of The _______ of the Carboniferous included snails,...

Question 2

Humans evolved during the _______ era.

Accepted Answer

The answer of Humans evolved during the _______ era....

Question 3

In undisturbed sedimentary rock, strata from the _______ period are immediately below rocks from the Ordovician period.

Accepted Answer

The Cambrian period is chronologically older than the Ordovician period, so its strata would be found below the Ordovician strata in undisturbed sedimentary rock.

Question 4

Which of the following eras in Earth's history is the longest?

Accepted Answer

The Precambrian era spans from the formation of the Earth around 4.6 billion years ago until the beginning of the Cambrian period, which started around 541 million years ago. This makes the Precambrian era the longest, covering almost 90% of Earth's history. The Paleozoic, Mesozoic, and Cenozoic eras all followed the Precambrian era in that order, with each one being shorter than the one before it. The Cambrian period is just the first period of the Paleozoic era.

Question 5

The half-life of carbon-14 (¹⁴C) is approximately 5,000 years.The ratio of ¹⁴C to carbon-12 (¹²C) in a fossil 25,000 years old would be _______ that of a living organism today.

Accepted Answer

Since carbon-14 has a half-life of 5,000 years, after 25,000 years, there will be 2^5 = 32 times less carbon-14 present in the fossil compared to a living organism today. Thus, the ratio of ¹⁴C to ¹²C in the fossil would be 1/32 that of a living organism today. Therefore, the best choice is D (1/32).

Question 6

The ratio of carbon-14 (¹⁴C) to its stable isotope, carbon-12 (¹²C), is relatively constant in living organisms and their environment; however, this changes once an organism dies.In a fossil approximately 40,000 years old,

Accepted Answer

The ratio of carbon-14 to carbon-12 in a fossil approximately 40,000 years old would be lower because carbon-14 is not replenished after death, while carbon-12 is relatively constant in the environment. As carbon-14 decays over time, the ratio decreases. Therefore, option B is the best choice.

Question 7

Which sample would be appropriate for dating by means of radioactive carbon?

Accepted Answer

Radioactive carbon dating can be used to date organic materials up to about 50,000 years old, making the mastodon sample appropriate. Option B is too old for carbon dating, C and D are non-organic materials, and E is too old for carbon dating by far.

Question 8

Oxygen-generating cyanobacteria liberated enough O₂ to open the door to _______ reactions in metabolic pathways, leading to the evolution of _______ cells.

Accepted Answer

Oxygen-generating cyanobacteria released oxygen, which allowed for oxidative reactions in metabolic pathways. This led to the evolution of eukaryotic cells which have more complex oxidative metabolism compared to prokaryotic or archaean cells. Therefore, the best choice is D.

Question 9

Which statement about Earth's lithospheric crust is true?

Accepted Answer

The lithospheric crust is made up of plates that can move due to continental drift.

Question 10

The geological process of subduction (characterized by one plate sliding under another) accounts for

Accepted Answer

The subduction of the Juan de Fuca Plate under the North American Plate has created the Cascade Mountains and associated volcanic activity.

Answer: B
 The collision of the Indian Plate and the Eurasian Plate has created the Himalayan mountain range through the process of subduction.

Answer: D
 The Chicxulub crater off the coast of the Yucatan Peninsula was formed by an asteroid impact and is not related to the process of subduction.

Answer: E
 The San Andreas Fault is a transform boundary, not a subduction zone.

Answer: C
 Stromatolites are formed by the accumulation of sedimentary layers built by microorganisms, and are not associated with the process of subduction.

Question 11

Which of the following gases have opposing effects on Earth's climate?

Accepted Answer

Carbon dioxide is a greenhouse gas that can warm the planet's temperature, while sulfur dioxide has a cooling effect by reflecting incoming solar radiation back into space. Therefore, these two gases have opposing effects on Earth's climate.

Question 12

A fossil of a marine crab, suspected to be 500 million years old, is discovered in South America.Which of the following is the most accurate way of determining the age of the fossil?

Accepted Answer

Radiometric dating of igneous rocks near the fossil using ⁴⁰K is the most accurate method for dating fossils that are millions of years old, as ¹⁴C dating is only effective for up to about 50,000 years.

Question 13

Over geologic time, the concentration of O₂ in Earth's atmosphere has increased.However, at the end of the _______ period, the O₂ concentration decreased significantly and was associated with _______.

Accepted Answer

C) Permian; mass extinctions.

Question 14

The first plants to produce seeds appeared in the _______ period.

Accepted Answer

The answer of The first plants to produce seeds appeared...

Question 15

During the _______ period of the _______ era, atmospheric O₂ level was almost equal to the present level, and multicellular life forms were abundant and diverse in the sea (but nowhere to be found, yet, on land).

Accepted Answer

The statement mentions the existence of multicellular life forms in the sea but not on land, which is a characteristic of the Cambrian period of the Paleozoic era. Additionally, during the Cambrian period, atmospheric oxygen levels were similar to the present day.

Question 16

For terrestrial animals and plants, the most recent mass extinction event that occurred prior to the evolution of humans took place approximately _______ million years ago.

Accepted Answer

The answer of For terrestrial animals and plants, the most...

Question 17

Which of the following is not considered evidence that large meteors struck Earth in the past?

Accepted Answer

The correct answer is B because "High CO₂ levels in the atmosphere in certain eras" does not represent a known or recognized form of evidence for large meteor impacts on Earth. The other options (A, C, D, E) are all considered evidence of past meteor impacts due to their association with impact events, such as craters, soot from fires, mass extinctions, and layers of iridium.

Question 18

The elimination of many forms of life following a meteorite impact led to new opportunities for mammals to evolve into a diversity of forms.As a result of this historic event, most of human evolution has occurred during the

Accepted Answer

The impact of the meteorite is believed to have occurred at the end of the Cretaceous period, approximately 66 million years ago. This event is known as the K-Pg extinction, which caused the elimination of many forms of life, including the non-avian dinosaurs. This extinction event also created new opportunities for mammals to evolve into a diversity of forms. Most of human evolution has occurred during the Quaternary period, which began approximately 2.6 million years ago and continues to the present day. Therefore, option C is the correct choice.

Question 19

Much of the _______ we now use for energy consists largely of the remains of plants that grew in swamps during the Carboniferous period.

Accepted Answer

The answer of Much of the _______ we now use...

Question 20

Refer to the figure, which illustrates a particular period in the fossil record.  Based on the fossil record, the period that corresponds to figure is the _______.

Accepted Answer

The answer of Refer to the figure, which illustrates a...

Quiz 24: The History of Life on Earth

The _______ of the Carboniferous included snails, scorpions, centipedes, insects, amphibians, and early amniotes

Humans evolved during the _______ era.

In undisturbed sedimentary rock, strata from the _______ period are immediately below rocks from the Ordovician period.

Which of the following eras in Earth's history is the longest?

The half-life of carbon-14 (¹⁴C) is approximately 5,000 years.The ratio of ¹⁴C to carbon-12 (¹²C) in a fossil 25,000 years old would be _______ that of a living organism today.

The ratio of carbon-14 (¹⁴C) to its stable isotope, carbon-12 (¹²C) , is relatively constant in living organisms and their environment; however, this changes once an organism dies.In a fossil approximately 40,000 years old,

Which sample would be appropriate for dating by means of radioactive carbon?

Oxygen-generating cyanobacteria liberated enough O₂ to open the door to _ reactions in metabolic pathways, leading to the evolution of _ cells.

Which statement about Earth's lithospheric crust is true?

The geological process of subduction (characterized by one plate sliding under another) accounts for

Which of the following gases have opposing effects on Earth's climate?

A fossil of a marine crab, suspected to be 500 million years old, is discovered in South America.Which of the following is the most accurate way of determining the age of the fossil?

Over geologic time, the concentration of O₂ in Earth's atmosphere has increased.However, at the end of the _ period, the O₂ concentration decreased significantly and was associated with _.

The first plants to produce seeds appeared in the _______ period.

During the _ period of the _ era, atmospheric O₂ level was almost equal to the present level, and multicellular life forms were abundant and diverse in the sea (but nowhere to be found, yet, on land) .

For terrestrial animals and plants, the most recent mass extinction event that occurred prior to the evolution of humans took place approximately _______ million years ago.

Which of the following is not considered evidence that large meteors struck Earth in the past?

The elimination of many forms of life following a meteorite impact led to new opportunities for mammals to evolve into a diversity of forms.As a result of this historic event, most of human evolution has occurred during the

Much of the _______ we now use for energy consists largely of the remains of plants that grew in swamps during the Carboniferous period.

Refer to the figure, which illustrates a particular period in the fossil record. Based on the fossil record, the period that corresponds to figure is the _______.

Quiz 24: The History of Life on Earth

The _______ of the Carboniferous included snails, scorpions, centipedes, insects, amphibians, and early amniotes

Humans evolved during the _______ era.

In undisturbed sedimentary rock, strata from the _______ period are immediately below rocks from the Ordovician period.

Which of the following eras in Earth's history is the longest?

The half-life of carbon-14 (14C) is approximately 5,000 years.The ratio of 14C to carbon-12 (12C) in a fossil 25,000 years old would be _______ that of a living organism today.

The ratio of carbon-14 (14C) to its stable isotope, carbon-12 (12C) , is relatively constant in living organisms and their environment; however, this changes once an organism dies.In a fossil approximately 40,000 years old,

Which sample would be appropriate for dating by means of radioactive carbon?

Oxygen-generating cyanobacteria liberated enough O2 to open the door to _______ reactions in metabolic pathways, leading to the evolution of _______ cells.

Which statement about Earth's lithospheric crust is true?

The geological process of subduction (characterized by one plate sliding under another) accounts for

Which of the following gases have opposing effects on Earth's climate?

A fossil of a marine crab, suspected to be 500 million years old, is discovered in South America.Which of the following is the most accurate way of determining the age of the fossil?

Over geologic time, the concentration of O2 in Earth's atmosphere has increased.However, at the end of the _______ period, the O2 concentration decreased significantly and was associated with _______.

The first plants to produce seeds appeared in the _______ period.

During the _______ period of the _______ era, atmospheric O2 level was almost equal to the present level, and multicellular life forms were abundant and diverse in the sea (but nowhere to be found, yet, on land) .

For terrestrial animals and plants, the most recent mass extinction event that occurred prior to the evolution of humans took place approximately _______ million years ago.

Which of the following is not considered evidence that large meteors struck Earth in the past?

The elimination of many forms of life following a meteorite impact led to new opportunities for mammals to evolve into a diversity of forms.As a result of this historic event, most of human evolution has occurred during the

Much of the _______ we now use for energy consists largely of the remains of plants that grew in swamps during the Carboniferous period.

Refer to the figure, which illustrates a particular period in the fossil record. Based on the fossil record, the period that corresponds to figure is the _______.

The half-life of carbon-14 (¹⁴C) is approximately 5,000 years.The ratio of ¹⁴C to carbon-12 (¹²C) in a fossil 25,000 years old would be _______ that of a living organism today.

The ratio of carbon-14 (¹⁴C) to its stable isotope, carbon-12 (¹²C) , is relatively constant in living organisms and their environment; however, this changes once an organism dies.In a fossil approximately 40,000 years old,

Oxygen-generating cyanobacteria liberated enough O₂ to open the door to _ reactions in metabolic pathways, leading to the evolution of _ cells.

Over geologic time, the concentration of O₂ in Earth's atmosphere has increased.However, at the end of the _ period, the O₂ concentration decreased significantly and was associated with _.

During the _ period of the _ era, atmospheric O₂ level was almost equal to the present level, and multicellular life forms were abundant and diverse in the sea (but nowhere to be found, yet, on land) .