fossil copy of an organism in a

rock

when all individuals of a species have died

set of all the fossils ever

discovered on Earth

chart that divides Earth’s history into different time

units

atoms of the same element that have different numbers of

neutrons

impression of an organism in

a rock

similar cells that work together and perform a function

preserved evidence of the activity of an organism

characteristic of a species that enables the species that survive in its environment

adaptation that enables

species to blend in with their

environments

to overcome by argument

resemblance of one species

to another species

process by which

populations of organisms with

variations that help them survive

in their environments live longer,

compete better, and reproduce

more than those that do not have

the variations

person who studies plants

and animals by observing them

the breeding of

organisms for desired characteristics

slight difference in the

appearance of individual members

of a species

body part

found in multiple species that

performs a similar function but

differs in structure

study of

similarities and differences among

structures of living species

science of the

development of embryos from

fertilization to birth

body part

found in mulitple species that is

similar in structure and position

but different in function

body part that

has lost its original function

through evolution