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Ch.15 Vocab

By:Kayla Thornton

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Across
6.changes an organism goes through as it matures
7.Largest time frame in geologic time scale
8.evolution due to chance event (2 Words)
13.the history of Earth and life of it (3 Words)
17.any trace of an organism that lived long ago
18.similar structure found in more than one species that share a common ancestor (2 Words)
19.change among species over time
21.change within a species/allelic frequencies over time
22.branch of biology that names, classifies, and identifies species
23.episode of great species loss (2 Words)
24.when all the continents were together
25.phylogeny based on derived characters
Down
1.evolution of a species
2.formation of a new species
3.short bursts of rapid evolution seperated by long periods of little or no evolution (2 Words)
4.large, general groups that are broken done into smaller, more specific groups (2 Words)
5.change in a species/population over time
9.study of how an organism matures from a zygote into a fully formed individual
10.one branch of a phylogenetic tree
11.the universal latin name for a species (2 Words)
12.one ancestral species evolves into many different species (2 Words)
14.the actual age in years (2 Words)
15.rough age of fossils determined by about how far down they are in rock layers (2 Words)
16.came up with the Linnaean system of classification (2 Words)
20.a two word name

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