Focus On Life Science: California Grade 7

Lesson 2: Early Earth History

Standards Check

1.
During the first billion years of Earth's history, ___________. 4.g
A)there was life everywhere
B)there was no life
C)trilobites evolved
D)vertebrates evolved
2.
The longest section of Earth's history was __________. 4.g
A)Paleozoic Era
B)Cretaceous period
C)Precambrian time
D)Cenozoic Era
3.
Where did the oxygen in Earth's atmosphere come from originally 4.g
A)from rocks
B)from plants
C)from animals
D)from cyanobacteria
4.
Why is the Precambrian fossil record so sparse? 4.g
A)All organisms lived on land.
B)Vertebrates developed then.
C)There were no living things.
D)Many of the organisms had soft bodies.
5.
What are Ediacara life-forms? 4.g
A)unique organisms that went extinct
B)direct ancestors of Cambrian life-forms
C)no one knows for sure
D)alien life-forms
6.
Which of the following is a species common during the Paleozoic Era? 4.g
A)dinosaurs
B)trilobites
C)Homo sapiens
D)Ediacara life-forms
7.
__________ are ancestors of reptiles. 4.g
A)Dinosaurs
B)Mammals
C)Birds
D)Amphibians
Grade 7
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