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What caused a variety of life-forms to appear in the Cambrian Period.
short spans of geologic time.
4.6 billion years ago
Age of Mammals
warm, shallow seas covering the continents.
absolute age
older
New mammal species developed.
Fishes
The rock sample that contains mostly the daughter isotope is...
short spans of geologic time.
4.6 billion years ago
Age of Mammals
warm, shallow seas covering the continents.
absolute age
older
New mammal species developed.
Fishes
When did the Earth begin forming?
short spans of geologic time.
4.6 billion years ago
Age of Mammals
warm, shallow seas covering the continents.
absolute age
older
New mammal species developed.
Fishes
The Cenozoic Era is known as the
short spans of geologic time.
4.6 billion years ago
Age of Mammals
warm, shallow seas covering the continents.
absolute age
older
New mammal species developed.
Fishes
When did organisms that formed index fossils live?
short spans of geologic time.
4.6 billion years ago
Age of Mammals
warm, shallow seas covering the continents.
absolute age
older
New mammal species developed.
Fishes
What happened when temperatures decreased during the ice ages of the Cenozoic Era?
short spans of geologic time.
4.6 billion years ago
Age of Mammals
warm, shallow seas covering the continents.
absolute age
older
New mammal species developed.
Fishes
The Paleozoic Era is also know as the Age of
short spans of geologic time.
4.6 billion years ago
Age of Mammals
warm, shallow seas covering the continents.
absolute age
older
New mammal species developed.
Fishes
The numeric or exact age of an object is called?
short spans of geologic time.
4.6 billion years ago
Age of Mammals
warm, shallow seas covering the continents.
absolute age
older
New mammal species developed.
Fishes
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