Game Smartz

Changes Over Time and Evolution

Science

Changes Over Time and Evolution Chapter Video

Changes Over Time and Evolution Chapter Video

cast

a fossil formed when dissolved minerals fill a mold and harden
cast Simple Definition

evolution

the change in a species over time
evolution Simple Definition

extinction

the death of all members of a species
extinction Simple Definition

fossil

the preserved traces and remains of an organism that lived long ago
fossil Simple Definition

fossil record

the history of life recorded by all the fossils we have collected
fossil record Simple Definition

gradualism

the evolution of a species, as a gradual change over time
gradualism Simple Definition

homologous structure

a similar structure in different species, like a whale fin, bat wing and your arm
homologous structure Simple Definition

mass extinction

when many species become extinct at the same time
mass extinction Simple Definition

mold

a rock fossil created when a buried organism dissolves
mold Simple Definition

natural selection

the individuals best suited to survive in an environment
natural selection Simple Definition

primate

mammals with features like opposable thumbs, forward looking eyes, and a large brain, like humans, monkeys or apes
primate Simple Definition

radioactive element

an unstable element that emits particles and energy as it changes into another element
radioactive element Simple Definition

speciation

the evolution of new species from an existing species
speciation Simple Definition

variation

any difference between members of the same species
variation Simple Definition

Related Chapters