GENBIO

Question 1

One billion years

Answer 1

Gigaannum

Question 2

are the longest portions of geologic time

Answer 2

Eons

Question 3

These divisions are called geochronological units

Answer 3

EONS ERAS PERIODS

Question 4

divides up the history of the earth based on life-forms that have existed during specific times since the creation of the planet.

Answer 4

The geologic time scale

Question 5

Subdivision of eons

Answer 5

HEDEAN ARCHEAN PROTEROZOIC PHANEROZOIC

Question 6

Subdivision of eons ( PRECAMBRIAN SUPEREON )

Answer 6

HEDEAN ARCHEAN PROTEROZOIC

Question 7

Subdivision of eons ( CAMBRIAN PERIOD )

Answer 7

Phanerozoic

Question 8

was the “Age of Early Life.” -continents formed and our modern atmosphere developed, while early life evolved and flourished 4.5 billion to 540 million years ago when earth was an ocean of magma.

Answer 8

Precambrian

Question 9

Events in the hadean Eon

Answer 9

Earth coalesced from a cloud of dust into a planet.

The Big Bang created all matter in the universe.

A magnetic field forms

Earth meet moon

Question 10

-named after the Greek god and ruler of the underworld Hades, is the oldest eon and dates from 4.5–4.0 billion years ago. This time represents Earth’s earliest history, during which the planet was characterized by a partially molten surface, volcanism, and asteroid impacts

Answer 10

Hadean Eon

Question 11

an older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth’s history, preceded by the Hadean Eon and followed by the Proterozoic.

Answer 11

Archean (beginning or primitive)

Question 12

that were active in the Archean eon (before approximately 2500 million years ago) in Precambrian time.

Answer 12

Volcanoes

Question 13

also called also called Cyanobacteriota or Cyanophyta,are a phylum of autotrophic gram-negative bacteria that can obtain biological energy via photosynthesis.

Answer 13

Cyanobacteria

Question 14

is a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotic.

Answer 14

Archea

Question 15

 is the most recent division of the Precambrian. It is also the longest geologic eon, beginning 2.5 billion years ago and ending 541 million years ago.

Answer 15

Proterozoic

Question 16

is the current and the latest of the four geologic eons in the Earth’s geologic time scale, covering the time period from 538.8 million years ago to the present.

Answer 16

Phanerozoic

Question 17

three eras of the phanerozoic

Answer 17

Paleozoic, Mesozoic and Cenozoic eras.

Question 18

means ‘ancient life.’ The oldest animals on Earth appeared just before the start of this era in the Ediacaran Period, but scientists had not yet discovered them when the geologic timescale was made.

Answer 18

Paleozoic (541-252 million years ago)

Question 19

marks an important point in the history of life on Earth; it is the time when most of the major groups of animals first appear in the fossil record. This event is sometimes called the “Cambrian Explosion,” because of the relatively short time over which this diversity of forms appears. It was once thought that Cambrian rocks contained the first and oldest fossil animals, but these are now found in the earlier

Answer 19

Cambrian Period

Question 20

which lived in shells resembling those of clams or cockles, and animals with jointed, external skeletons known as arthropods the ancestors of insects, spiders, and crustaceans.

Answer 20

Brachiopods

Question 21

is a geologic period and system, the second of six periods of the Paleozoic Era spans 41.6 million years from the end of the Cambrian Period 485.4 Ma to the start of the Silurian Period 443.8 Ma

Answer 21

Ordovician Period

Question 22

the most remarkable biological event was the evolution and diversification of fish

Answer 22

Silurian Period

Question 23

was a time of major evolutionary innovation in the marine realm  ‘Age of Fishes‘  419.2 million years ago

Answer 23

Devonian

Question 24

creatures in Silurian period

Answer 24

trilobites graptolites conodonts corals, stromatoporoids, mollusks.

Question 25

lasted from about 359.2 to 299 million years ago* during the late Paleozoic Era. its term comes from England, in reference to the rich deposits of coal that occur there. These deposits of coal occur throughout northern Europe, Asia, and mid western and eastern North America. sometimes called the Age of Amphibians because of the diversification of early amphibians

Answer 25

The Carboniferous Period

Question 26

is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period 298.9 million years ago.

Answer 26

The Permian ( Age of Land Vertebrates )

Question 26

Permian -Triassic mass extinction is also known as

Answer 26

the "Great Dying"

Question 27

95% of life on Earth disappeared Land ecosystem took nearly 30 years to recover All life today are descendants of 5% of species which survived the extinction

Answer 27

Permian -Triassic mass extinction ("Great Dying"

Question 28

means 'middle life' and this is the time of the dinosaurs.

Answer 28

Mesozoic (252- 66 million years ago)

Question 29

is the second-to-last era of Earth's geological history, lasting from about 252 to 66 million years ago, comprising the Triassic, Jurassic and Cretaceous Periods.

Answer 29

The Mesozoic Era

Question 30

The Mesozoic is divided into three time periods:

Answer 30

the Triassic (245-208 Million Years Ago), the Jurassic (208-146 Million Years Ago), the Cretaceous (146-65 Million Years Ago)

Question 30

is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago (Mya), to the beginning of the Jurassic Period 201.4 Mya. marked the beginning of major changes that were to take place throughout the Mesozoic Era. the land masses of the world were still bound together into the vast supercontinent known as Pangea

Answer 30

The Triassic Period

Question 31

second of three periods of the Mesozoic Era. Extending from 201.3 million to 145 million years ago, it immediately followed the Triassic Period (251.9 million to 201.3 million years ago)

Answer 31

Jurassic Period

Question 31

was a supercontinent derived from the Greek pangaia, meaning “all the Earth.”

Answer 31

Pangea

Question 32

ancient continental mass in the Northern Hemisphere that included North America, Europe, and Asia (except peninsular India).

Answer 32

Laurasia

Question 33

ancient supercontinent that incorporated present-day South America, Africa, Arabia, Madagascar, India, Australia, and Antarctica.

Answer 33

Gondwana

Question 34

dominated the terrestrial ecosystem. originated in the Paleozoic Era

Answer 34

Gymnosperms (“naked-seed” plants)

Question 35

is a geological period that lasted from about 145 to 66 million years ago. It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic.

Answer 35

The Cretaceous period

Question 36

sleek, hydrodynamic predators that terrorized the world's oceans during the late Cretaceous period--represented the pinnacle of marine reptile evolution,

Answer 36

Mosasaurs

Question 37

________, was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago. The event caused the extinction of all nonavian dinosaurs

Answer 37

Cretaceous–Tertiary (K–T) extinction

Question 38

means 'recent life. ' During this era, plants and animals look most like those on Earth today is sometimes called ”The Age of Mammals”, because the largest land animals have been mammals during that time.

Answer 38

Cenozoic Period

Question 39

They lived from the late Miocene epoch into the Holocene about 4,000 years ago, and various species existed in Africa, Europe, Asia, and North America.

Answer 39

Mammoth

Question 40

is an extinct family of piglike artiodactyls which inhabited the Northern Hemisphere from the late Eocene to the early Miocene epochs, about 38-19 million years ago.

Answer 40

Entelodontidae