Chapter 5 Vocabulary Flashcards Preview

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Flashcards in Chapter 5 Vocabulary Deck (20):
1

Species

A group of similar organisms that can mate with each other and produce fertile offsprong

2

Fossil

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

3

Adaptation

A trait that helps an organism survive and reproduce

4

Evolution

The gradual change in a species over time

5

Scientific Theory

A well-tested concept that explains a wide range of observations

6

Natural Selection

The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species

7

Variation

Any difference between individuals of the same species

8

Homologous Structures

Body parts that are structurally similar in related species provide evidence that the structures were inherited from a common ansector

9

Branching Tree

A diagram that shows how scientists think different groups of organisms are related

10

Petrified Fossil

A fossil formed when minerals replace all or part of an organism

11

Mold

A type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part

12

Cast

A type of fossil that forms when a mold becomes filled in with minerals that then harden

13

Relative Dating

A technique used to determine which of two fossils is older

14

Radioactive Dating

A technique used to determine the actual age of a fossil on the basis of the amount of a radioactive element it contains

15

Radioactive Element

An unstable element that breaks down into a different element

16

Half-Life

The time it takes for half of the atoms in a radioactive element to break down

17

Fossil Record

The millions of fossils that scientists have collected

18

Extinct

Term used to indicate a species that does not have any living members

19

Gradualism

The theory that evolution occurs slowly but steadily

20

Punctuated Equilibra

The theory that species evolve during short periods of rapid change.