Cosmos: Episode 2 - Some of the Things Molecules Do

When humans force evolution by selecting certain traits to breed for, this is

• natural selection

• dna fingerprinting

• artificial selection

• codominance

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What trait was selected for in wolves that led to domestication?

• Lower levels of stress hormones

• Sharper teeth

• Aggressive behavior

Humans have a common ancestor with

• Bacteria

• Trees

• Wolves

• All of the above

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The trunk on the tree of life represents

• Dinosaurs

• Apes

• Single-cell organisms

• Bananas

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How many major extinction events do we know about?

• 1

• 5

• 10

• Thousands

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Who in the world can have identical DNA to you?

• Only an identical twin

• Any other mammal

• Any other living creature

• Any other human

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The rivers and rain on Titan are composed not of water but of:

• Copper

• Methane

• Coffee

• Uranium

Broken limbs on the tree of life represent

• Humans

• Sterile animals

• Extinct species

• Animals with short life spans

Why was white fur selected for in bears at the North Pole?

• It allowed them to reflect more sunlight

• It gave them better heat regulation

• It helped them blend in with the snow and ice to sneak up on prey

• It made them cuter

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What trait is coded for in both trees AND humans?

• How to undergo photosynthesis

• How to grow a layer of bark

• How to metabolize sugar

• How to jump really high