The Origins Of Life & Speciation Flashcards

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1
Q

Why do some species become extinct?

A
New predators 
New diseases 
New competition for food
Can't survive in incorrect climate 
Can't find food needed
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2
Q

What does extinct mean?

A

No living examples of a species is surviving

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3
Q

What does the term species mean?

A

Organisms with many common factors which can breed successfully and produce fertile offspring

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4
Q

How do new species arise?

A

Genetic variation & natural selection
Population isolation
Mass extinction

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5
Q

What can cause environmental isolation?

A

Climate change

Land may move (continental drift)

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6
Q

When is life predicted to have started?

A

3.5 billion years ago

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7
Q

Why so fossils occur?

A

When a dead animal falls to the bottom of the sea/lake and is trapped in a layer of sediment

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8
Q

What can disrupt the fossil record?

A

Rock cycle

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