Evolution Review

The gradual change in a population/species over time is

• Mutation

• Evolution

• Adaptation

• Variation

Study of embryos of various organisms to show a common ancestor because of similarities in development

• natural selection
• embryology
• speciation
• evolution

Some organisms that share a common ancestor have features that have different functions, but similar structures.  These are known as

• vestigial structures
• analogous structures
• homologous structures
• fossil structures

Humans, birds, whales, and lizards all have similar arm bones. What is the reason for this?

• The function of these bones is the same in all animals
• They live in similar environments
• They have a common ancestor
• All organisms resemble humans

Vestigial structures

• structures that perform a similar function but are not similar in origin

• remnants of once-important structures that have slowly lost all or most of their function

• features found in different organisms that share structural similarities but may have very different functions

• preserved remains of an organism

Which layer is the youngest?

• 1

• 2

• 3

• 4

What is this an example of?

• Homologous structure

• Analogous structure

• Vestigial organs

• Functional adaption

According to this data, the unknown bacterial species is most closely related to: 

• Species I
• Species II
• Species III
• Species IV

If two organisms have similar traits of DNA, they probably

• share a common ancestor

• share a common environment

• share a common population

• speciation

Which layer is the oldest?

• B

• A

• E

• C