The factor that a scientist changes in a study is the 

• independent variable
• dependent variable

The dependent variable goes on the 

• x axis
• y axis
• equator
• slope

When you read a scientific study, you should 

• ask critical questions and identify potential sources of bias
• assume everything that is written is totally true

A scientific theory is proven to be true

• true
• false

A scientific theory has a lot of evidence to support it

• true

• false

The process by which all organisms change slowly over time because of slight gene variations is called

• natural selection
• artificial selection
• evolution
• gene pool

In addition to observing living organisms, Darwin studied the preserved remains of ancient organisms called

• fossils
• adaptations
• homologies
• vestigial structures

An inherited characteristic that increases an organism's ability to survive and reproduce in its specific environment is called (n)

• vestigial structure
• adaptation
• speciation
• analagous structure

Structures that have different mature forms but develop from the same embryonic tissue are called 

• analagous
• adaptations
• homologous
• fossils

Which of the following conditions are necessary for natural selection to occur?

• overproduction of offspring
• variation within a population
• struggle for existence
• all of the above