Evolution Introduction

Scientific theories are based on

• general assumptions of how systems work.

• mathematical principles that can be proven true.

• large amounts of data (evidence) collected over time.

• observations from within only one scientific discipline.

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What makes an organism more "fit" than other organisms in its population?

• It can survive to produce more offspring than others

• It is bigger than the others

• It is able to mate more than others

• It is able to find more food than others

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How do fossils show the comparison from ancient to modern species?

• Ancient organisms are similar to moderns; yet differ in several ways

• Ancient organisms were a different size compared to modern; otherwise identical

• Ancient and modern species are the exact same

• Ancient and modern species have nothing in common

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measure of an organisms's ability to survive and produce offspring relative to other members of a population 

• Natural Selection
• Adaptation
• Fitness
• Variation

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Structures with the same parts have different functions; suggests that organisms share a common ancestry

• vestigial structures
• homologous structures
• adaptive radiation
• fossil

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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

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The picture shows a/an ___________

• homologous structure

• vestigial structure

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The changes of species over time

• Embryonic 
• Natural selection 
• Mimicry 
• Evolution 

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The similarities of the bones in the diagram provide evidence that---

• The organisms shown lived in the same natural envionrment
• The organisms shown may have developed from a common ancestor
• The organisms shown have the same genetic diseases
• All vertebrate species have identical forelimbs

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In stage one (top row) of these embryos, most of the embryos________

• look very similar.
• have very different features.
• show different stages of development.
• have only a tail if they are non-human.

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