Final Exam Flashcards

1
Q

Biological conservation

A

Stewardship of the natural world

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2
Q

Resource conservation

A

Sustainable use of renewable natural resources

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3
Q

How have humans affected biodiversity?

A

We have caused a global biodiversity crisis, destroying biodiversity at a catastrophic rate.

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4
Q

What is coffee associated with?

A

Destruction of tropical evergreen forest

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5
Q

Is extinction bad?

A

Yes and no because it’s been a a part of natural biological change.

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6
Q

How many species have gone extinct?

A

Most species that have ever evolved are now extinct (99 percent).

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7
Q

Mass extinction

A

Events when large number of species go extinct simultaneously

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8
Q

How many mass extinction periods are there?

A

Six

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9
Q

When was Earth formed?

A

4550 Ma

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10
Q

What was the first sign of life of Earth? When?

A

Prokaryotes at 4 million years ago.

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11
Q

When do first eukaryotes occur?

A

2 million years ago.

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12
Q

When did multicellular organisms occur?

A

1-2 million years ago

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13
Q

When did the extinct events occur?

A

541 Ma to now.

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14
Q

When were humans first on Earth?

A

2 Ma

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15
Q

What happened in the first extinction? Why?

A

25% of marine families go extinct because of global cooling.

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16
Q

What happened in the second period of mass extinction occur? Why?

A

19% of marine families go extinct due to global climate change from volcanism.

17
Q

When did the the greatest extinction began?

A

245 mya

18
Q

What is the greatest extinction known as?

A

The Permian mass extinction known as “The Great Dying.”

19
Q

What happened in the greatest mass extinction? Why?

A

54% of families and 96% of species go extinct due to a volcanic activity in Siberia. This affects both terrestrial and aquatic animals were at risk

20
Q

What happened in the third extinction? Why?

A

23% of families, usually dinosaur-like animals and dinosaurs, experience extinction due to volcanic extinction.

21
Q

What is the last mass extinction event?

A

Cretacious-Tertiary (K/T) event.

22
Q

When did the last mass extinction occur?

A

65 mya

23
Q

What happened in the last mass extinction event? Why?

A

17% of families and 76% of species go extinct due to a meteorite impact in Mexico’s Yucatan Peninsula

24
Q

What species were in trouble in the last extinction? Why?

A

World goes dark and no photosynthesis, thus the high trophic levels at trouble, such as the end of dinosaurs.

25
Q

What happens after an extinction event?

A

Periods of adaptive radiation as newly-evolved organisms now occupy now-vacant niches.

26
Q

Adaptive radiation

A

New forms of species evolve out of a single precursor.

27
Q

What are our ancestors 64 mya? After K/T extinction?

A

Nocturnal mammals with poor eyesight but good smell and hearing.

28
Q

What is an adaptive radiation in Canada?

A

The Burgess Shale in BC. Layers of rocks on a mountain showing the extinct or adaptive radiation organism.

29
Q

What is the Cambrian explosion? When?

A

Adaptive radiation that occurred after the first mass extinction event. 542 mya.

30
Q

What are one of the most common marine fossils in Burgess Shale?

A

Trilobites, bottom feeding organism.

31
Q
A