Unit 6: Change Over Time Review(2)

A trait that helps an organism survive and reproduce is called a(n)...

• adaptation

• variation

• selection

• mutation

When a species competes for resources such as food, mates, or territory it is called...

• adaptations

• competition

• variations

• overproduction

Using the phylogenetic tree above, which of the following species does not have tail flukes?

• Blue Whale

• Dorudon

• Killer Whale

• Pakicetus

Which trait identifies the major difference between a hippo and a blue whale

• Loss of external hind legs

• Underwater nursing

• Living in seawater

• carnivorous diet

True or False: Variation Among organisms of a species are caused by random mutations in their genes

• True

• False

True or False: A Theory is an scientific observation that can be proved by math.

• True

• False

What did Charles Darwin infer about organisms in South America and the Galapagos Islands?

• The Galapagos organisms looked more like organisms from Africa.

• The Galapagos organisms were completely unrelated to the organisms found on mainland South America.

• The Galapagos organisms were virtually identical to the organisms found on mainland South America.

• The Galapagos organism looked similar to the mainland South America organisms but they had become different species.

Physical (visual) differences between members of the same species are called...

• adaptations

• mutations

• variations

• competition

The gradual change in a species over long periods of time is called...

• mutation

• evolution

• variation

• migration

How does natural selection lead to evolution?

• stronger offspring kill weaker members of the species

• environmental changes kill weaker members of the species

• beneficial traits accumulate among surviving members of the species and are passed on to the next generation

• overproduction provides food for stronger members of the species