Changes Over Time Vocabulary

a change or the process of change by which an organism or species becomes better suited to its environment

an object made by shaping molten metal or a similar material in a mold

the change in characteristics of a species over several generations and relies on the process of natural selection

no longer in existence

the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock

a group of fossils which has been analyzed and arranged chronologically and in taxonomic order

a policy of reform that is not sudden

the time required for any specific property to decrease by half

an example of an organ or bone that appears in different animals

a hollow container used to give shape to molten or hot liquid material (such as wax or metal) when it cools and hardens