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Everything > Life > Flashcards

Life Flashcards

1
Q

Age of Earth

A

4.5 billion years old

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2
Q

Beginning of life

A

3.8 billion years ago

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3
Q

Emergence of large multi-complex celled organisms we might call animals.

A

One billion years ago

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4
Q

When did animals move onto land?

A

400 million years ago

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5
Q

When did the dinosaurs go extinct?

A

65 million years ago

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6
Q

When was the Cambrian Explosion?

A

550 million years ago

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7
Q

When did the era of the dinosaurs begin?

A

250 million years ago

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8
Q

How long ago did the first simple cells form?

A

~3.8 billion years ago

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9
Q

How did the first simple cells form?

A

From a mixture of chemicals, perhaps combined with extreme heat near a deep-sea vent or strike of lightning or comet. This was just a membrane around a sac of liquid that slowly absorbed CO2.

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10
Q

How long ago did complex-cells start forming?

A

~3 billion years ago

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11
Q

How do single complex-cell organisms form?

A

A simple cell absorbs another cell. The absorbed cell evolves into an ‘organelle’ (mini organ) inside the initial cell providing vital cell functions.

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12
Q

How long ago did complex cells start evolving into multi-complex cella’s organisms?

A

2 billion years ago

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13
Q

How were multi-complex celled organisms formed?

A

Perhaps through failed cell splitting

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14
Q

What is the nostalgic name for the time before the Cambrian Explosion?

A

The Garden of Ediacara

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15
Q

What was the Cambrian Explosion the inception of?

A

Predation

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16
Q

Why did the Cambrian Explosion lead to accelerated evolution?

A

The inception of predation means animals had to evolve ways to survive their new predators or die. Predators then had to evolve in response.

17
Q

What are the two components of a nervous system?

A

A series of cells that co-ordinate movement. Cells that respond to external stimulus (like light). The two connected create a basic nervous system.

18
Q

How did animals transition to land?

A

Animals and plants were deposited on land via floods and through river banks. Those that evolved were richly rewarded with predator-less land.

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