No, dinosaurs did not exist in the pre-cambrian period
<h3>Food chain</h3>
A food chain is a chain of different animal species that are dependent on the next as a source of food. If one source dies, then the chain starts to break.
<h3>Food webs</h3>
Food webs are a system off overlapping food chains. Basically meaning, many food chains combined together.
<h3>Pyramid Model</h3>
A pyramid model includes the following:
- Primary Producers
- Primary Consumers
- Secondary Consumers
- Tertiary Consumers
Hope this helps! :)
<h2>-CloutAnswers </h2>
