8th Grade Unit 4 Review

Which statement is true about fossils?

• Fossils have provided a complete history of Earth's life forms.

• Much of the evidence for evolution comes from fossils.

• A fossil never includes a complete organism.

• A fossil shows the evolution of an entire species.

Which of the following statements does the fossil record support?

• Not all species that are alive today were alive in the past.

• Earth’s organisms have remained unchanged throughout its history.

• All organisms that have ever existed on Earth continue to live on Earth today.

• Dinosaurs are the only types of organisms that have become extinct.

A reptile fossil has been found. It shows evidence of modified scales that look similar to bird feathers. What inference can be made based on this evidence?

• It shows a link between ancient reptiles and birds.

• The reptile species went extinct due to the evolution of birds.

• Reptiles evolved directly into birds.

• The reptile species was alive at the same time as birds.

Which of the following levels is the most broad in the Linnean classification hierarchy?

• class

• kingdom

• domain

• species

Which statement is TRUE about organisms classified as Eubacteria?

• they are all prokaryotes

• they are all eukaryotic

• they are all parasitic

• they are all multicellular

In 1859, Charles Darwin proposed his theory of evolution based on natural selection. What observation about the natural world does this theory explain?

• how a species always retains its characteristics

• how the fossil record was formed

• how a species changes over time

• how catastrophic events lead to extinctions

Some weed species have developed the ability to resist pesticides. How does the Theory of Evolution by natural selection help to explain this ability?

• Due to genetic variations, some weeds in the population had the ability to resist pesticides.

• The weeds developed pesticide-resistant variations because their survival depended on it.

• As the weeds evolved, natural selection resulted in an unfavorable variation in a population.

• In any population of weeds, some weeds will be naturally immune to all kinds of pesticides.

The Theory of Evolution by natural selection states that certain organisms are more likely to survive and reproduce than others. What do these organisms possess in order to survive?

• adaptive traits

• large body size

• similar characteristics

• ability to reproduce sexually

Which number on the illustration represents the species level?

• 4

• 1

• 2

• 3

Adaptations in a population may lead to the evolution of new species.  Which word is MOST associated with the process of evolution?

• change

• continuity

• extinction

• stability