FOSSIL RECORD AND INTRO TO EVOLUTION

The horse fossil record from three time periods shows the differences in the hooves and teeth of horses from each time period.

Which of the following statements is supported by the horse fossil record?

• The horse used to be a carnivore.

• The horse has changed over time.

• The horse has many common ancestors.

Which statement describes the BEST evidence that two modern species share a common ancestor?

• The species are about the same size

• The species eat the same type of food

• The species have similar DNA sequences

A scientist is examining a fossilized insect that may be an ancestor of modern dragonflies. Which of the following should the scientist use to best determine how closely related the fossilized insect is to modern dragonflies?

• radioactive dating

• comparative anatomy

• plate tectonics

1. According to scientists, donkeys and horses share a common ancestor. Which evidence shows that the two organisms are related?

• Both are tall.

• Both run fast.

• They have similar bones

Scientists recovered a preserved woolly mammoth from the frozen soil of Siberia. The DNA sequence of the mammoth was very similar to the DNA sequence of the African Elephant. Which of the following conclusions is best supported by this information?

• The African Elephant and the Woolly Mammoth are closely related.

• The African Elephant evolved directly from the Woolly Mammoth.

• The Wooly Mammoth has very few similarities to the African Elephant

Scientists have concluded that snakes evolved from an ancestor with legs. Which of the following statements provides the best evidence for this conclusion?

• Most species of snakes live on land.

• Snakes move extremely fast to catch their prey.

• Some species of snakes have limb buds during their embryonic development

Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence BEST supports this hypothesis?

• They eat the same food

• They live in the same part of the ocean

• They have similar anatomical structures.

Which of the following observations best supports the conclusion that two modern animal species evolved from a common ancestor in recent geological histoy?

• The species are both herbivores.

• The species have similar DNA sequences

• The species live in the same environment.

Evolution can be seen in the fossil record in which of the following ways?

• Organisms in the fossil record are identical to living organisms.

• The fossil record provides ecidance that organisms have changed over time.

• The fossil record provides evidance that all organisms developed at the same time

The picture below shows a Horseshoe Crab. Today’s Horseshoe Crabs are related to trilobites. Trilobites lived more than 251 million years ago and are extinct. Which organism is most likely a Trilobite?

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