Chap 6

Question 1

Cyanobacteria

Answer 1

Photosynthetic bacteria thought to be one of earths earliest life forms

Question 2

Eon

Answer 2

Longest subdivision in the geologic time scale that is based on the abundance of certain types of fossils

Question 3

Epoch

Answer 3

Next smaller division of geologic time after the period, characterized by differences in life forms

Question 4

Era

Answer 4

2nd longest division of geologic time, based on the major worldwide changed in types of fossils

Question 5

Geologic time scale

Answer 5

Division of earths history into time units based on the types of life forms that lived only during certain periods

Question 6

Mesozoic era

Answer 6

Era of middle life, a time of many changes on earth including dinosaurs appearing and Pangea splitting

Question 7

Natural selection

Answer 7

Process by which organisms that are well adapted to a particular place will survive better and reproduce than organisms that aren’t

Question 8

Organic evolution

Answer 8

Change of organisms over geologic time

Question 9

Paleozoic era

Answer 9

Era of ancient life, when organisms developed hard parts

Question 10

Pangea

Answer 10

Large, ancient landmas that was composed of all continents joined together

Question 11

Period

Answer 11

3rd longest division of geologic time, characterized by the types of life that existed worldwide

Question 12

Precambrian time

Answer 12

Longest part of earths history

Question 13

Species

Answer 13

Group of organisms that only reproduced with members of their own group

Question 14

Trilobite

Answer 14

Organism with a 3-lobed exoskeleton that was abundant in Paleozoic oceans and is considered an index fossil

Question 15

Cenozoic era

Answer 15

Era of recent life that includes the first appearance of homo-sapiens