a body part or behavior that helps a living organism to survive

the remains or traces of organisms that lived long ago

living things that are born and live around the same time period

a plant's response to light

a characteristic that is visible only when two recessive alleles for the same trait are inherited

something an organism does to get the things it needs to live and survive

includes footprints, tracks, trails, and burrows made by ancient living things

a plant's response to stimuli

one of a pair of genes that determines a specific genetic trait

all the fossils of the Earth together

differences in traits among organisms of the same species

copying another organism in order to survive

petrified remains of animal dung which can reveal that the animal ate and shows what other living things shared the animal's environment

a deep sleep to avoid the cold winter and lack of available resources, such as food and water

the study of how traits are passed from parent to offspring

hardened tree sap that has a living organism inside

a behavior that an animal develops by observing other animals, or by being taught

kept whole and intact (in rock, tar, or ice)

new organisms that come from parent organisms

a table showing all the possible combinations of alleles for a trait resulting from a genetic cross

a plant's response to touch

impressions of parts of organisms left in soil or sediment before it hardens. Thin objects such as leaves, fish, and feathers, form these

a behavior that an animal inherits from its parents; also known as instinct

an organism's way of hiding, or blending into surroundings, in order to survive

able to stay alive

an action that an organism does that enables it to live and survive

a plant's response to gravity

a quality that describes a living thing or object

a model in the shape of a living thing or its remains, that forms when minerals or rock particles fill the space in the mold

a type of fossil that occurs when organic material is compressed, leaving only a carbon residue, or film, behind

a body part or structure that enables a living organism to live and survive

forms when minerals replace the bone, shell, or other hard part that was trapped, turning it into rock

material found in a cell's nucleus, that determines the genetic traits of the organism

the characteristic visible when at least one dominant allele for a trait is inherited

a plant's response to water

the passing of traits from one generation to another

a characteristic that is passed from parents to their offspring

a space in a rock that has the shape of the remains of an ancient living thing that once filled the space

moving from one location to another in order to survive

organisms that have similar traits and are able to produce offspring