Chapter 7 And 8

Question 1

Species

Answer 1

A group of organisms that can mate with one another to produce fertile offspring.

Question 2

Evolution

Answer 2

The process in which populations gradually change over time.

Question 3

Fossil

Answer 3

The remains or imprints of once living organisms found in a layer of rocks.

Question 4

Fossil record

Answer 4

A historical sequence of life indicated by fossils found in layers of earths crust.

Question 5

Trait

Answer 5

A genetically determined characteristic

Question 6

Selective breeding

Answer 6

The process in which humans select which plant or animals to reproduce based on a certain desire traits.

Question 7

Natural selection

Answer 7

The process by which individuals that are better adapted to their environment survive and reproduce more successfully than less well adapted individuals.

Question 8

Generation time

Answer 8

The period between the birth of one generation and the birth of the next generation.

Question 9

Speciation

Answer 9

The formation of new species as a result of evolution.

Question 10

Adaptation

Answer 10

A characteristic that helps an organism survive and reproduce in an environment.

Question 11

Relative dating

Answer 11

Estimating the age of rocks and fossils in this way.

Question 12

Absolute dating

Answer 12

A method that measures the age of fossils or rock in years.

Question 13

Geologic time scale

Answer 13

Calendar scientists use to outline the history of life on earth.

Question 14

Extinct

Answer 14

Describes a species that has died out completely

Question 15

Plate tectonics

Answer 15

The theory of how these huge pieces of crust move around the earth.

Question 16

Precambrian time

Answer 16

Is the time from the formation of earth 4.6 billion years ago to about 542 million years ago.

Question 17

Paleozoic era

Answer 17

The geologic era that followed Precambrian time and that

lasted from 542 million to 251 million years ago.

Question 18

Mesozoic era

Answer 18

Began about 251 million years ago and lasted about 185.5 million years,

Question 19

Cenozoic era

Answer 19

Began about 65 million years ago and continues today.

Question 20

Primate

Answer 20

A group of mammals that includes humans, apes. Monkeys, and lemurs.

Question 21

Hominid

Answer 21

A type of primate characterized by bipedalism, relatively long lower limbs, and lack of a tail..

Question 22

Homo sapiens

Answer 22

Modern humans are classified as this.