Choose several plants and animals that lived in the oceans of the time. Try to explain something of how they lived. Our understanding of different geologic periods is the result of much hard work done by paleontologists in the field and researchers in laboratories throughout the world. Many museums, universities, and organizations support such work. As you find information at their sites, make sure to investigate the ongoing work they are sponsoring and the people who are carrying out this work.
Geologic periods end for a number of reasons.
Changes in climate, mass extinctions, formation or breakup of super - continents are just a few examples of events that bring about global changes. Such changes can alter forever the life - forms and conditions found on Earth. All information, pictures, photographs, etc that you find at websites MUST be acknowledged. The name of the website and web address should be found for all sites used in your project. A good report will draw on information from a variety of sources.