When did abundant fossil evidence appear in the geologic record?
2.7 billion years ago
1.0 billion years ago
100 million years ago
540 million years ago

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above