Were mollusks the first animals to evolve respiratory organs?
Mollusks were not the first animals to evolve respiratory organs. The first animals to evolve respiratory organs were actually the early arthropods, such as trilobites, which lived around 520 million years ago during the Cambrian period.
To find this information, you can follow these steps:
1. Start by searching for "evolution of respiratory organs" on a reliable search engine.
2. Look for reputable scientific sources such as research papers, scientific articles, or educational websites.
3. Focus your search on the Cambrian period, which is known for the rapid diversification and evolution of many animal groups.
4. Explore the information you find and evaluate the credibility of the sources to ensure accurate information.
By following these steps, you will be able to find reliable sources that explain how early arthropods were the first animals to evolve respiratory organs, predating the evolution of respiratory organs in mollusks.