Changes Over Time

A scientific theory is....

• an educated guess that has been right over and over again backed by lots of evidence.

• a choice people make in their lives that can be right or wrong for them.

• an educated guess that could be right or wrong, but only pertains to that specific situation.

Many facts put together support a....

• theory

• hypothesis

• scientific fact

• claim

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Why is evidence such an important part of the theory making process?

• to eliminate wrong theories

• to be certain about the theories that are right

• to give support to the theory

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A scientific theory should always be based on a full set of...

• observations

• proven facts

• claims

• guesses

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The Law of use/disuse was part of who's theory?

• Darwin

• Buffon

• Lamarck

• Tusi

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Darwin's theory of evolution consisted of which of the following?

• Genetic variation already exists in a population

• Traits are inherited through genes passed down from parents

• Change over time

• Nature favors one gene over others (natural selection)

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Lamarck's Theory state...

• Throughout their lifetimes animals improved themselves

• Changes are caused by the struggle to survive

• Acquired traits are passed to offspring

• Law of Use / Disuse

According to Darwin's Theory of evolution, Changes in a population occur

• fast

• slowly

• once in a while

• almost never

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According to Lamarck's theory changes are caused by the struggle to survive

• True

• False

Lamarck and Darwin agreed that

• Organisms have changed over time (evolved)

• Genes are changed by an individual’s life experiences or activities

• Organisms change to better fit their environment

• Nature favors one gene over others (natural selection)