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Evolution

Across
Essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population.
Biological change process by which descendants come to differ from their ancestors
Climate and natural resources of a land
Changes in land forms, resulted from slow changes over a long period of time
Foot, head, hand
The process by which humans select traits through breeding
Remnants of organs or structures that had a function in an early ancestor
muscles of the ear, wisdom teeth, the appendix, the tail bone
Explains how evolution can occur
important because that way the species can inherit traits that can help them survive better in their unique environment
Measure of survival and ability to produce more offspring
Giant tortoises: weighed up to 600 lbs, moved 4 miles a days Finches: had different beaks depending on which island it came from
Down
Features that are similar in function but appear in different organisms
Geological process that shape earth are uniform through time.
Structures that perform a similar function in a origin
Allowed Darwin to understand geology.
Feature that allows an organism to better survive in its environment
Darwin observed fossil shells of marine organisms high up in the Andes mountains
human embryos develop from fertilization to birth
Study of fossils or extinct organisms.
Remains of an animal that died
Bones, shells, teeth
Natural disasters such as floods
Because resources are limited in nature, organisms with heritable traits that favor survival and reproduction will tend to leave more offspring than their peers, causing the traits to increase in frequency over generations
Group of organisms that can reproduce and have fertile offspring