Cambrian Explosion

When did the Cambrian Explosion happen?

• 541 Million Years Ago
  Through serious Radiations and while Phyla was first appearing.
• 263 Billion Years Ago
  Through a Lack of oxygen in the Ozone layer.
• At the end of the Jurassic Period about 319 Million Years Ago
• 540 Million Years Ago

Why is the Cambrian Explosion Important?

• Because Scientists like to name old stuff fancy names.
• Because the Sea "Exploded" with magmaic gasses and acid air.
• The Cambrian Period makes an important turnaround in what could have been full extinction (100%) of life on Earth
• Because scientists couldn't officially agree on what it should be called, so instead of calling it the Cambrian Period, they called it the Cambrian Explosion.

Why is it called the Cambrian Explosion?

• The Cambrian Period marks an important point in the history of
  life on Earth.
• It is the time when most of the major groups of animals first appear in the fossil record.
• It is called the Cambrian Explosion because of the limited short time when the diversity appears.
• Because the sea basically "Exploded" with many ife forms with billions of animals.
  AND
  It is called the Cambrian Explosion because of the limited short time when the diversity appears.

Prehistory is the study of

• Scientific remains of old fossils, shells, & slides.
• The period of time before written records.
• Scientific Geozone's and Ozones that helped to cause the Cambrian Radiation
• Science

The Main Study on the topic of this category is called...
(Not mentioned in the slide.)

• Uneducated Guesses
• Scientism
• Scientists
• Earth Science

Which Animal Group did NOT start in the Cambrian Explosion?

• Small Shelly Fauna
• Burgess Crustaceans
• Early Crustaceans
• Trace Fossils

What Animal Groups were in the Explosion?

• Trace Fossils, Early Crustaceans, and Burgess Crustaceans.
• Tree monkeys, Early Crustaceans, and Fauna
• Small Shelly Faunas, Early Ordovician Radiation, Burgess Shale Faunas, Trilobites and Echinoderms.
• Tree monkeys, Evolved Apes, Burgess Shale Faunas, and Trace Fossils