Diversity of Animals
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When did invertebrate first appear in the fossil record, and what was this called?
What does the Cambrian Explosion refer to?
The sudden appearance of a multitude of animals
Explanation for Cambrian Explosion (3)
- Escalating predator-prey relationships
- Increased atmospheric oxygen
- Genetic changes- in developmental genes
How did the escalating predator-prey relationships come about?
Animals evolved locomotion and active predation, so others had to evolve defenses to avoid being consumed
How does an increase in atmospheric oxygen effect animals?
Animals have a higher metabolic rate and grow larger
What genetic changes occurred during the Cambrian Explosion?
- Hox genes
- Facilitated new body forms
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