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Abi Biology 2017 > Cambrian Explosion > Flashcards

Cambrian Explosion Flashcards

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1
Q

What was the Cambrian explosion?

A

A diversification of life that occurred in a (relatively) short period of time

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2
Q

How long was the Cambrian period?

A

55 million years

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3
Q

What appeared during the Cambrian period?

A

The early forms of most animal groups appeared in this time

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4
Q

What is the evolution of the horse?

A 
Hyracotherium
Mesohippus
Merychippus
Pliohippus
Equus
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5
Q

What is the genus of a human?

A

Homo

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6
Q

When do scientists estimate the first homo to have appeared?

A

2,2 mya

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7
Q

Where did the first homo appear?

A

In Africa

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8
Q

What was the first homo species?

A

Homo habilis

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9
Q

What other similar species did homo habilis live with?

A

Australopithecus

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10
Q

What is Australopithecus?

A

A bidpedal primate with both ape-like and human-like characteristics

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11
Q

Why did homo habilis have more skill in making tools than Australopithecus?

A

They had a larger brain capacity

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12
Q

What homo species came after homo habilis?

A

Homo erectus

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13
Q

What were homo erectus like?

A

They had large upright bodies

They resembled modern humans more an Australopithecus

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14
Q

What did homo erectus do?

A

They were probably the first hominins to migrate from Africa via Europe and Asia

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15
Q

What species are considered to be the direct ancestors of modern humans?

A

Homo sapiens

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16
Q

What is the brain capacity of Homo sapiens?

A

1400 cm^3

17
Q

Why have modern humans not become extinct like other hominins?

A

Their large brain capacity has allowed them to change their environment to suit their needs

18
Q

What are living fossils?

A

Life forms that have changed very little over millions of years

19
Q

What are three examples of living fossils?

A

Coelacanth
Cycads
Turtles

20
Q

What is the coelacanth?

A

A species of fish

21
Q

Why is the coelacanth thought to be a living fossil?

A

It was thought to have become extinct 70 mya

Many have since been found off the South African coast

22
Q

What is special about the coelacanth?

A

It thought it be one of the transitional forms between fish and terrestrial animals

23
Q

Why is the coelacanth thought it be one of the transitional forms between fish and terrestrial life forms?

A

Its internal organs resemble those of the first land animals

Its fins are also thought to be in the first stage of developing into legs

Abi Biology 2017 (57 decks)

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