Question 1

adaptive trait

Accepted Answer

a trait that makes it more likely that an individual will survive in a specific environment

Question 2

ancestor

Accepted Answer

a related organism from a previous generation

Question 3

body structure

Accepted Answer

a part of an organism (for example, one or more bones)

Question 4

common ancestor population

Accepted Answer

an older population from which two or more newer species descended

Question 5

descendant species

Accepted Answer

a more recent species that evolved from an ancestor population

Question 6

environment

Accepted Answer

everything (living and nonliving) that surrounds an organism

Question 7

evolution

Accepted Answer

a process by which species adapt to environmental changes over a very long time

Question 8

evolutionary time

Accepted Answer

the very long time that spans the history of the earth, from the very first cellular life to the present

Question 9

extinct

Accepted Answer

having died out completely and no longer alive anywhere

Question 10

generation

Accepted Answer

a group of individuals born and living at about the same time

Question 11

inherit

Accepted Answer

to receive genes from a parent

Question 12

limb

Accepted Answer

an organism's arm, leg, or wing

Question 13

mutation

Accepted Answer

a random change to a gene that sometimes results in a new trait

Question 14

natural selection

Accepted Answer

traits in a population changes over many generations.

Question 15

population

Accepted Answer

a group of the same type of organism living in the same area

Question 16

Accepted Answer

sharing a common ancestor population

Question 17

shared structure

Accepted Answer

a body structure in two or more species that features the same parts (for example, the same bones)

Question 18

speciation

Accepted Answer

the process by which one population evolves into two or more different species

Question 19

species

Accepted Answer

a group of organisms of the same kind that do not reproduce with organisms from any other group

Question 20

stability

Accepted Answer

when something stays mostly the same overtime

Question 21

trait

Accepted Answer

a specific characteristic of an individual organism

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