A hypothesis that has not been tested.

A well-tested explanation for a wide range of observations or experimental results.

An unproven idea that lacks evidence.

A collection of unrelated facts.

the preserved remains or traces of an organism that lived in the past

a type of rock formed from volcanic activity

a living organism found in modern ecosystems

the process of natural selection over time

A type of fossil that provides evidence of the activities of ancient organisms; ex. fossilized footprints

A type of fossil formed from the remains of an organism

A type of fossil that is created through volcanic activity

A type of fossil that consists of preserved soft tissues

a process in which individuals that are better adapted to their environment are more likely to survive and reproduce

a method of breeding plants and animals for desired traits

a theory that explains the origin of species through divine intervention

a phenomenon where all individuals in a population have equal chances of survival

the condition where some organisms produce more offspring than can survive

the process of reducing the number of offspring to ensure survival

the phenomenon where all offspring survive to adulthood

the strategy of producing fewer offspring with higher survival rates

all the fossils that have been discovered and what we have learned from them

a collection of ancient artifacts from human history

the study of living organisms in their natural habitats

a chronological timeline of geological events

an inherited characteristic that all organisms of a species has that increases an organism's chance to survive and reproduce

a temporary change in behavior due to environmental factors

a learned skill that improves an organism's ability to find food

a physical change that occurs only in response to immediate threats

A fossil that consists of the preserved body of an animal or plant or an imprint of the body

A fossil that only contains mineralized remains

A fossil that is formed from the remains of a single organism

A fossil that shows the behavior of ancient organisms

random genetic mutations during the reproduction process produce variations in offspring

genetic variation is solely caused by environmental factors

genetic variation occurs only in plants and animals

genetic variation is the result of selective breeding

Selection by humans for breeding of useful traits from the natural variation among different organisms

Natural selection occurring without human intervention

The process of selecting organisms based on their physical appearance

A method of breeding that eliminates all genetic variation

the structures of an organisms body

the study of animal behavior

the process of digestion

the classification of living organisms

the scientific principle that all organisms on Earth evolved from the very first organism

a type of organism that has no relation to any other species

a concept that suggests organisms can evolve without any common lineage

a theory that all species were created independently

a fully developed organism

an organism in the earliest stage of development

a stage of cellular division

a type of genetic mutation

the process by which a group of related organisms die out

the gradual change in the characteristics of a species over time

the introduction of new species into an ecosystem

the survival of the fittest in a natural environment

similar structures that related species have inherited from a common ancestor

structures that serve the same function but have different evolutionary origins

structures that are completely unrelated in function and form

structures that are identical in form but serve different functions

the struggle between organisms to survive in a habitat with limited resources

a cooperative interaction between different species

the process of natural selection favoring the strongest individuals

the ability of organisms to adapt to their environment

a trait that benefits an organism and helps it survive and reproduce.

a characteristic that is harmful to an organism's survival.

a feature that has no impact on an organism's life.

a trait that decreases an organism's chances of reproduction.

a group of similar organisms that can breed and produce offspring that can also reproduce

a classification of organisms based on their habitat

a type of organism that is extinct

a group of organisms that cannot reproduce

any difference between individuals of the same species

a change in the environment affecting species

the process of natural selection

a type of genetic mutation