Origins, Speciation, and Mass Extinction

Earth formed 4.5 billion years ago, but life did not show until around...

• 3.5 billion years ago
• 1 million years ago
• 200,000 years ago
• 4.2 billion years ago

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Which of the following describes what the first life form resembled?

• Eukaryotes
• Plants
• Bacteria
• Fungi

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What do we call a group of individuals that can reproduce successfully in nature?

• species

• order

• speciation

• mom and dad

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Members of the same species will always have a similar body appearance.

• true

• false

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Members of a species can breed with other members of the same species.

• True

• False

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When two or more populations no longer successfully reproduce it is called...

• species

• order

• speciation

• a shame

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Which are causes of speciation? Choose all that apply

• Isolation caused by mountains, rivers and man-made structures

• preference for different foods

• change in environment

• different mating behaviors

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What word do we use to describe a species which has no members still living?

• endangered
• extinct

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Which of these describes a likely reason why a species would become extinct after a major environmental change?

• The environmental change means fewer predators are around.

• There are more homes for the species in the changed environment.

• The change in the environment opens new resources with less competition.

• There are not enough members of the species born with a trait necessary to survive in the new environment.

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What is a mass extinction?

• When all the species in a particular area on earth suddenly go extinct
• When multiple species from all over the earth suddenly go extinct 
• When one species goes extinct due to habitat changes
• When all life on earth is wiped out 

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