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Chapter 13 Review
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Why are there gaps in the fossil record?
Not everything fossilizes
Do changes in the environment CAUSE mutations?
no
Who started the theory of natural selection?
Charles Darwin
What are some causes for extinction?
Low mutation rates, environmental change, climate change, food sacristy
As environmental conditions change over time, which population will have a better chance of survival?
A population with a high level of variation
Occur randomly and produce variation in a population
Mutations
The location in which fossils appear in the sedimentary layers is used to piece together an evolutionary sequence of life on Earth called __________________________________.
FOSSIL RECORD
_____________________________ is the process of how organisms acquire adaptations over time.
EVOLUTION
_____________________________ is an organism from which others have descended.
ANCESTOR
_____________________________ share common evolutionary origins, but can be functionally unalike.
HOMOLOGOUS STRUCTURE
_____________________________ is a process by which organisms with favorable traits survive and reproduce more successfully.
NATURAL SELECTION
_____________________________ is used by biologists to illustrate evolutionary relationships between organisms and their ancestors.
CLADOGRAM
_____________________________ occurs when the environment changes and the adaptations of a species are no longer sufficient for its survival
EXTINCTION
Greater _____________________________ signifies a larger variety of alleles, and therefore greater survivability of a species over time.
GENETIC VARIATION
___________________ increase an organism’s chance of survival in their environment.
ADAPTATION
__________________ are typically found in sedimentary rock and offer clues into evolutionary history
FOSSILS
Animals with backbones
VERTEBRATES
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