« Previous 1 3 4
Click flashcard terms on the left to see their definitions.
High Scores
Waterfall Game Scores
Match Game Times
image licenses
Some of the images from this list come from Flickr and/or Wikipedia and are licensed under the Creative Commons. This product uses the Flickr API but is not endorsed or certified by Flickr.
Share This List

All terms in this list:

mutation: a random change in an organisms' DNA, which results in that organism having a different trait or characteristic

trait: a characteristic that an organism has (examples: brown fur, blue eyes, long neck, etc.)

law of superposition: the law which states that the further down you dig, the older the rocks (and fossils) are.

natural selection: the slow process by which organisms adapt to new environmental pressures, sometimes referred to as "survival of the fittest."

evolution: Developed by Charles Darwin, this theory states that organisms change very slowly over time to become more advanced new species. This process is driven by natural selection.

ancestor: An organism from which another has descended

descendent: an organism that has descended from an ancestor

common ancestor: When two organisms evolved from the same organism we call that organism their ___________ ___________.

vertebrate: An organism that has a backbone

invertebrate: An animal that has no backbone

Cambrian Explosion: A period of time during the Paleozoic Era when many marine invertebrates evolved and appeared in the fossil record for the first time

geologic time scale: How scientists measure Earth's long history

Paleozoic Era: "Ancient life." This was the first era after Precambrian time, when many group of animals were evolving, including invertebrates, and the first vertebrates

Mesozoic Era: "Middle life," The Age of Reptiles, when dinosaurs evolved and became extinct at the end

Cenozoic Era: "Recent Life," The Age of Mammals, characterized by several dramatic changes in climate and periodic ice ages

Jurassic: The second period of the Mesozoic

Triassic: The first period of the Mesozoic, dinosaurs and mammals appear in the fossil record for the first time

Cretaceous: The third and final period of the Mesozoic Era which ended in a mass extinction

Permian extinction: The largest mass extinction of Earth's history, took place at the end of the Paleozoic, over 95% of marine life became extinct

Periods: Eras are broken down into smaller chunks called ___________.

epochs: Periods are broken down into smaller chunks of time called ____________.

mass extinction: When a large number of species become extinct within a relatively short period of time.

environmental pressure: Any factor that makes it more difficult for organisms to survive (limited food, water, space, predators, etc.)

adaptation: A characteristic that helps an organism survive the process of natural selection

Pangaea: giant supercontinent that broke apart during the Mesozoic Era.

amphibian: an animal that lives part of its life on land and part under water

reptile: a vertebrate with scaly skin, that lays eggs, some have a shell

mammal: a warm-blooded vertebrate that feeds its young milk (examples: mice, humans, tigers, bears, horses, elephants, sloths, etc.)

Tertiary Period: The first period in the Cenozoic Era

Quaternary: The second period of the Cenozoic Era, the one we are living in now

radioactive dating: a method scientists use to figure out a rock or fossils absolute age

relative age: The age of a rock or fossil compared to other rocks or fossils

absolute age: the exact number of years since a rock or fossil formed

index fossil: fossils of widely distributed organisms who lived during a known amount of time

Friends with BookmarkOS

Definitions from Wiktionary under the GNU FDL.
Sentences copyrighted by their respective publishers.
terms of service privacy policy